Ultrasound: Types, Uses, Procedure & What to Expect
Ultrasound is a widely used medical imaging test that creates pictures of structures inside the body using high-frequency sound waves. Also called sonography or ultrasonography, it can help health professionals examine organs, blood vessels, soft tissues, pregnancy, and many other areas without using ionizing radiation. The examination is usually performed with a handheld device called a transducer, which sends sound waves into the body and receives the echoes that return. A computer converts those echoes into images that can be viewed in real time. Because the images can show movement, ultrasound is particularly useful for watching a heartbeat or evaluating blood flow. Most routine ultrasound examinations are noninvasive and require little or no recovery afterward.
Ultrasound is used in many areas of medicine rather than being limited to pregnancy imaging. Doctors may order an abdominal ultrasound to examine the liver, gallbladder, kidneys, pancreas, spleen, or major blood vessels. Pelvic ultrasound can provide information about the uterus, ovaries, bladder, and surrounding tissues, while vascular ultrasound evaluates blood movement through arteries and veins. Ultrasound can also examine the thyroid, breast, muscles, tendons, joints, testicles, and other accessible structures. Specialized forms such as Doppler ultrasound provide additional information about blood flow. The exact examination chosen depends on the symptoms, body area, clinical question, and information the health care professional needs.
For many patients, the word ultrasound creates questions about preparation, discomfort, safety, and what the images might reveal. The experience varies because an abdominal scan is performed differently from a transvaginal, transrectal, cardiac, or vascular ultrasound. Some examinations require fasting, while others require drinking water so that the bladder is full. Most external scans involve gel being placed on the skin while a sonographer moves the transducer across the area being examined. Internal ultrasound procedures can cause temporary pressure or discomfort but are generally designed to be performed as gently as possible. Understanding the types, uses, procedure, preparation, and limitations of ultrasound can make the appointment feel much more predictable.
What Is Ultrasound and How Does It Work?
Ultrasound is a diagnostic imaging technique that uses sound waves at frequencies higher than people can normally hear. A transducer generates these sound waves and directs them into the body, where they travel through tissues and fluids in different ways. When the waves encounter boundaries between tissues, some of the sound returns to the transducer as an echo. The ultrasound equipment measures these returning signals and uses them to build an image on a monitor. Different tissues create different echo patterns, allowing trained professionals to recognize structures and abnormalities. Because this process happens rapidly, many ultrasound images can be viewed in real time rather than only as a single still picture.
The transducer is one of the most important parts of an ultrasound machine because it both sends and receives sound waves. During a standard external scan, the sonographer places ultrasound gel between the transducer and the patient’s skin. The gel removes tiny pockets of air that could interfere with transmission of sound waves from the probe into the body. The sonographer then moves, tilts, or gently presses the transducer to obtain different views of the structure being examined. Images appear immediately on the ultrasound monitor as the probe moves. The sonographer may save still pictures, measurements, and short moving sequences for a radiologist or other qualified clinician to review.
Different body structures interact with ultrasound waves differently, which affects how they appear on the screen. Fluid-filled areas often transmit sound well and can appear relatively dark on standard ultrasound images, while many solid tissues produce stronger echoes. Bone and air can interfere with the passage of ultrasound waves, making certain structures difficult to examine with this imaging method. This is one reason ultrasound works particularly well for many soft tissues but cannot answer every medical question. The interpretation is more complex than simply looking for light or dark areas because appearance depends on technique, anatomy, equipment, and the condition being investigated. Proper interpretation therefore requires medical imaging expertise rather than relying on the image alone.
Real-time imaging gives ultrasound several practical advantages over some other diagnostic tests. A sonographer can watch organs move, observe a fetal heartbeat, assess the movement of tendons, or study blood flowing through vessels while the examination is taking place. The probe can also be repositioned immediately if another angle is needed. This flexibility helps health professionals examine an area dynamically rather than relying entirely on predetermined images. Ultrasound can also guide procedures because the clinician can watch a needle move toward a target while viewing surrounding tissues. Biopsies, fluid drainage, injections, and certain vascular procedures may therefore use ultrasound guidance. Real-time imaging is one of the reasons ultrasound remains valuable across many medical specialties.
Ultrasound should be understood as one imaging tool among several rather than a replacement for every X-ray, CT scan, or MRI. Each imaging technique has strengths and limitations depending on the clinical question. Ultrasound is especially useful when doctors need real-time views of soft tissues, blood flow, pregnancy, or structures located where sound waves can reach them effectively. CT may provide a broader view of certain internal injuries or complex anatomy, while MRI can offer detailed imaging of many soft tissues in situations where ultrasound is limited. X-rays remain highly useful for examining bones and the chest. A health professional chooses the imaging method that is most likely to answer the specific medical question safely and effectively.
Common Types of Ultrasound
A standard diagnostic ultrasound is often performed externally by moving a transducer over the skin above the body area being examined. Abdominal ultrasound is a common example and may be used to evaluate organs such as the liver, gallbladder, kidneys, pancreas, spleen, and abdominal aorta. Pelvic ultrasound can also be performed externally through the lower abdomen to examine structures within the pelvis. A full bladder may sometimes improve visualization during a transabdominal pelvic scan because fluid provides a useful pathway for sound waves. External ultrasound is usually painless, although temporary pressure from the probe may feel uncomfortable over a tender area. The examination normally ends as soon as the required images and measurements have been obtained.
Transvaginal ultrasound uses a specially designed transducer that is placed gently inside the vagina to obtain closer views of pelvic structures. Because the probe is positioned nearer to the uterus and ovaries, it can sometimes provide more detailed images than a transabdominal pelvic scan. It may be used to investigate pelvic pain, abnormal bleeding, ovarian or uterine findings, fertility-related questions, or early pregnancy. The transducer is covered appropriately and lubricated before insertion, and only part of the probe needs to enter the vaginal canal. Patients may experience pressure or mild discomfort, particularly if the pelvis is already sensitive. They should tell the sonographer if they experience significant pain or have concerns at any point.
Transrectal ultrasound involves inserting a narrow ultrasound probe gently into the rectum to examine nearby structures, most commonly the prostate. Because the prostate lies close to the rectum, this approach can provide useful images that may not be available from an external examination alone. Transrectal ultrasound may be used in the evaluation of certain prostate concerns or to guide specific procedures. Preparation varies depending on the reason for the examination, and patients should follow the instructions provided by their medical team. Some people experience pressure or temporary discomfort while the probe is positioned. The sonographer or clinician can explain what will happen before beginning so that the patient knows what sensations to expect.
Doppler ultrasound is a specialized technique that evaluates movement, particularly the flow of blood through arteries and veins. It can measure the direction and speed of blood flow and may display this information as colors, waveforms, sounds, or numerical measurements. Doctors may use Doppler ultrasound when evaluating narrowed arteries, blocked veins, blood clots, circulation problems, blood flow in organs, or certain aspects of pregnancy. Carotid ultrasound, for example, can examine blood flow through arteries in the neck that supply the brain. Doppler techniques are also widely incorporated into cardiac and vascular imaging. The patient usually experiences the examination much like a standard ultrasound, although pulse-like sounds may be heard while blood flow measurements are collected.
Other ultrasound technologies include three-dimensional ultrasound, four-dimensional ultrasound, echocardiography, musculoskeletal ultrasound, point-of-care ultrasound, and contrast-enhanced ultrasound in selected circumstances. Three-dimensional ultrasound reconstructs multiple images to create a more three-dimensional representation, while four-dimensional imaging displays three-dimensional information over time. Echocardiography uses ultrasound to examine the heart’s structures, movement, and function. Musculoskeletal ultrasound can assess muscles, tendons, ligaments, joints, and other superficial structures during movement. Point-of-care ultrasound may be performed by trained clinicians at the bedside to answer focused clinical questions quickly. These variations use the same fundamental principle of sound-wave imaging but are adapted for different medical purposes.
What Is an Ultrasound Used For?
Abdominal symptoms are among the common reasons a health professional may recommend ultrasound. The examination can provide information about the liver, gallbladder, bile ducts, kidneys, pancreas, spleen, and abdominal blood vessels, although the visibility of each structure can vary. Ultrasound may help investigate abdominal pain, swelling, abnormal laboratory results, suspected gallstones, certain kidney problems, or an enlarged organ. It can identify some fluid-filled structures and solid abnormalities and may show changes that need additional investigation. However, a normal ultrasound does not rule out every possible cause of abdominal symptoms. Depending on the clinical situation, a doctor may recommend laboratory testing, CT, MRI, endoscopy, or another examination afterward.
Pelvic ultrasound is commonly used to examine reproductive and urinary structures. In people with a uterus and ovaries, it may help evaluate pelvic pain, abnormal bleeding, uterine fibroids, ovarian cysts, fertility-related concerns, or the position of certain devices. Depending on the clinical question, the examination may include both transabdominal and transvaginal imaging because each approach provides different views. Ultrasound can often determine whether a pelvic finding is predominantly fluid-filled or solid, although additional testing may still be necessary. Bladder imaging can provide information about urinary retention or other selected urinary concerns. The meaning of any finding depends on symptoms, age, medical history, and the appearance of the structures being examined.
Vascular ultrasound focuses on arteries and veins and is particularly useful because Doppler techniques can show blood movement in real time. Doctors may order it when they suspect a blood clot in a deep vein, a condition known as deep vein thrombosis, or when they need to evaluate circulation through an artery. A vascular examination may also investigate swelling in a limb, reduced blood flow, narrowed arteries, or certain vascular abnormalities. The sonographer may apply mild pressure at different points during a venous examination to see whether a vein compresses normally. Blood-flow measurements may also be recorded at specific locations. Findings can help clinicians decide whether monitoring, medication, additional imaging, or another form of treatment is appropriate.
Ultrasound is frequently used to evaluate superficial structures because the transducer can be positioned very close to the area of interest. Thyroid ultrasound can examine the size and appearance of the thyroid gland and characterize nodules that may require observation or further investigation. Breast ultrasound may help evaluate certain lumps or findings detected during another breast imaging examination, although it does not replace mammography in every situation. Scrotal ultrasound can assess the testicles and surrounding tissues when someone experiences pain, swelling, or a mass. Musculoskeletal ultrasound can examine tendons, muscles, joints, and soft-tissue abnormalities. The usefulness of the scan depends on the structure, symptoms, and experience of the professionals performing and interpreting it.
Ultrasound also plays an important role in guiding medical procedures. A clinician may use real-time imaging to identify a target and monitor the position of a needle during a biopsy, aspiration, drainage procedure, vascular access, or selected injection. Seeing surrounding tissues can help the clinician choose an appropriate path and avoid certain nearby structures. Ultrasound guidance is used in many specialties because the equipment can often be brought directly to the procedure area. It does not eliminate every procedural risk, and some interventions are better guided by CT, X-ray, MRI, or other methods. The choice of guidance method depends on the target, location, procedure, and clinical circumstances. Patients should receive separate instructions when their ultrasound is part of an invasive procedure.
Pregnancy Ultrasound and What It Can Show
Pregnancy ultrasound uses the same basic sound-wave technology to examine the fetus and structures involved in pregnancy. Depending on the stage of pregnancy and reason for the scan, ultrasound may help estimate gestational age, evaluate fetal growth, identify the number of fetuses, assess fetal movement and heart activity, and examine the location of the placenta. It can also provide information about amniotic fluid and many aspects of fetal anatomy. Some examinations are routine, while others are ordered because of symptoms, previous findings, maternal health conditions, or concerns about fetal development. The timing and number of scans therefore vary between pregnancies. Individual prenatal care recommendations should come from the health professional managing the pregnancy.
Early pregnancy ultrasound may be performed through the abdomen or with a transvaginal probe, depending on how early the pregnancy is and what needs to be evaluated. Transvaginal imaging can provide detailed views during early pregnancy because the uterus is positioned relatively close to the probe. A clinician may use early ultrasound to help establish the location of a pregnancy, estimate gestational age, determine whether there is more than one embryo or fetus, or evaluate symptoms such as bleeding or pain. What can be seen depends strongly on how far the pregnancy has progressed. A scan performed very early may not provide a definite answer, and another ultrasound or additional testing may be needed later.
A detailed pregnancy ultrasound performed later can examine fetal anatomy and growth more extensively. The sonographer may obtain images of the head, brain, spine, heart, abdomen, limbs, and other structures that can be assessed with ultrasound. Measurements can help estimate fetal size and compare growth with the expected stage of pregnancy. The scan may also assess placenta location and amniotic fluid. Ultrasound can identify many fetal abnormalities, but it cannot detect every medical or genetic condition, and some findings may remain uncertain. Fetal position, gestational age, maternal anatomy, movement, and technical factors can all affect visibility. Additional specialized ultrasound or other testing may be recommended when a concern is identified.
Doppler techniques can sometimes be used during pregnancy to evaluate blood flow within selected maternal or fetal vessels. These examinations are generally performed when there is a medical reason to obtain additional information rather than simply as a routine visual feature. Three-dimensional ultrasound can reconstruct surface or anatomical views, and four-dimensional ultrasound shows those images moving over time. These technologies can have specific clinical uses in selected pregnancies. However, obtaining prolonged ultrasound exposure solely to create entertainment videos or keepsake images is generally discouraged. Diagnostic ultrasound should be performed appropriately by qualified professionals who understand equipment settings, fetal imaging, and the medical significance of the findings.
Pregnancy ultrasound can be exciting for parents, but it remains a medical examination rather than a guarantee that every aspect of fetal health can be determined. A reassuring scan means that the structures assessed appeared appropriate within the limitations of that examination, not that every possible condition has been excluded. Similarly, an unexpected finding does not always mean that a serious problem is present. Some observations represent normal variations, technical limitations, or findings that need another scan before their significance becomes clear. A qualified clinician can explain what was seen and whether follow-up is recommended. Patients should avoid trying to diagnose fetal health from individual ultrasound images or measurements without appropriate medical interpretation.
How to Prepare for an Ultrasound
Preparation depends on the type of ultrasound because different examinations require different conditions for the clearest possible images. Some scans require no special preparation beyond wearing comfortable clothing and arriving at the scheduled time. Other examinations may require fasting for several hours so that food, intestinal gas, or contraction of the gallbladder does not reduce image quality. Pelvic or urinary ultrasound may require a full bladder, which means patients may be instructed to drink water before the appointment and avoid urinating. These instructions are not interchangeable between exams. Patients should follow the preparation information provided by their imaging center rather than using instructions from a different type of ultrasound.
For certain abdominal ultrasound examinations, patients may be asked not to eat or drink for a period before the scan. Fasting can improve visualization of structures such as the gallbladder and may reduce some interference from digestive activity and intestinal gas. The required fasting period can vary according to the examination, medical facility, age, and health circumstances. People who have diabetes, take essential medication with food, or have another condition that makes fasting difficult should ask the medical team for individualized instructions. They should not skip required medications unless specifically instructed to do so. Clear preparation helps improve image quality while also keeping the examination safe for the individual patient.
A full bladder may be requested before certain pelvic, pregnancy, bladder, or urinary ultrasound examinations. When filled with fluid, the bladder can help provide a clearer acoustic window for structures deeper in the pelvis. Patients may be told how much water to drink and how long they should avoid emptying their bladder before the appointment. Following the instructions closely can prevent delays or the need to repeat part of the examination. If the bladder becomes painfully full, the patient should tell the imaging staff rather than trying to tolerate severe discomfort. Depending on the scan, staff may modify the plan or allow partial emptying while preserving enough bladder filling for useful images.
Clothing and practical preparation are usually straightforward. Loose, comfortable clothing can make it easier to expose only the body area that needs to be examined, although a medical gown may be provided. Jewelry or accessories near the examination area may need to be removed. Patients should bring any requested identification, referral documents, previous imaging information, or relevant medical records according to the facility’s instructions. It can also be useful to know the names of current medications and any major medical conditions. If an internal ultrasound or ultrasound-guided procedure is planned, additional preparation instructions may apply. Asking about preparation before appointment day can prevent unnecessary uncertainty.
Patients should tell the imaging team about any circumstances that could affect the examination or make them uncomfortable. Relevant information may include recent surgery, significant pain, mobility limitations, pregnancy status when appropriate, or difficulty maintaining a particular position. Someone scheduled for an internal ultrasound may also wish to discuss previous painful examinations, anxiety, or concerns about the procedure beforehand. Health care professionals can often explain the steps and make reasonable adjustments where possible. Preparation is not only about food or water; it also involves making sure the team understands factors that may affect safety, comfort, or image quality. Clear communication can make the entire ultrasound experience smoother.
What Happens During an Ultrasound Procedure?
When patients arrive for a routine ultrasound, they are usually checked in and then taken to an examination room containing an ultrasound machine and adjustable examination table. A sonographer may confirm the patient’s identity, the body area being examined, and relevant medical information before beginning. Depending on the scan, the patient may remain in their clothing with one area exposed or change into a gown. The sonographer positions the patient so the target area can be viewed effectively. Most people begin lying on their back, although they may later be asked to turn onto one side or change position. These changes help obtain images from different angles.
For an external ultrasound, a water-based gel is placed on the skin over the area being examined. The gel may feel cool or warm depending on the facility, but it should not cause pain. The sonographer presses the transducer against the gel and moves it slowly across the skin while watching images on a nearby monitor. At certain points, the probe may need to be angled or pressed more firmly to obtain a clear view. Pressure may feel uncomfortable if the underlying area is already painful or tender. Patients should communicate if the discomfort becomes significant because the sonographer may be able to adjust pressure or positioning.
The sonographer may pause frequently to take measurements, save images, or record short video clips. During an abdominal examination, the patient may be asked to hold their breath briefly because breathing moves organs and can change the view. A vascular examination may involve pressure on the skin, changes in leg or arm position, or repeated measurements of blood flow. During some scans, the patient may hear sounds produced by Doppler measurements. These noises represent blood-flow information and do not indicate that something is necessarily wrong. The examination can feel repetitive because the sonographer often needs several images of the same structure from different directions.
Internal ultrasound procedures are performed differently because the transducer is introduced through a natural body opening rather than moved only across the skin. Transvaginal and transrectal probes are designed specifically for these examinations and are covered and lubricated appropriately. The health professional should explain the procedure before inserting the probe and should work carefully to minimize discomfort. Internal ultrasound usually provides closer views of certain organs because less tissue lies between the transducer and the target structure. Patients can speak up at any time if they experience significant pain or want clarification about what is happening. Respect, privacy, and communication remain important throughout the examination.
Most routine diagnostic ultrasound examinations are completed relatively quickly, although the time varies with complexity and the number of structures being assessed. A focused examination may take less time, while a detailed study can take longer because many images and measurements are required. Once imaging is complete, the gel is wiped from the skin and the patient can usually dress and resume ordinary activities immediately. There is typically no sedation or recovery period for standard external ultrasound. Internal examinations also generally require no recovery unless another procedure was performed at the same time. The sonographer may need to check that all required images have been obtained before the patient leaves.
Understanding Ultrasound Results and Limitations
After an ultrasound examination, the images are typically reviewed by a qualified medical professional who is trained to interpret that type of imaging. In many diagnostic imaging departments, a radiologist reviews the scan and prepares a report for the clinician who requested the examination. Other specialists may interpret certain studies, such as cardiologists reviewing echocardiograms or appropriately trained obstetric professionals evaluating pregnancy imaging. The sonographer obtains the images but may not be the person responsible for giving a final diagnosis. This is why patients are sometimes told that results will be discussed later. The exact reporting process and turnaround time vary among hospitals, clinics, specialties, and the urgency of the medical situation.
An ultrasound report generally describes the structures examined and any findings considered relevant to the clinical question. Measurements, appearance, blood-flow information, or observations about masses, fluid collections, stones, cysts, organs, or other structures may be included depending on the type of scan. Some findings can be confidently characterized, while others are described more cautiously because ultrasound alone cannot determine exactly what they represent. Terms such as “indeterminate” do not automatically mean cancer or another serious disease. They usually mean additional information is needed before the finding can be classified. The referring clinician combines imaging results with symptoms, physical examination, laboratory tests, and medical history before deciding what happens next.
Ultrasound has important limitations because sound waves do not travel equally well through every part of the body. Air and gas can block or scatter ultrasound waves, which can make structures behind the lungs or gas-filled bowel difficult to evaluate. Bone also limits penetration, so ultrasound generally cannot see deeply through adult bone in the way some other imaging methods can. Body size, depth of the structure, wounds, positioning, movement, and other technical factors may influence image quality. These limitations do not mean the examination was performed incorrectly. Sometimes anatomy or the medical question simply requires a different imaging method to obtain the necessary information.
The accuracy of an ultrasound examination depends on several factors, including the condition being investigated, equipment, patient anatomy, examination technique, and expertise of the people performing and interpreting the study. Some conditions have characteristic ultrasound appearances, whereas others can look similar to benign or temporary changes. A normal scan does not exclude every possible condition, especially when symptoms involve structures ultrasound cannot visualize well. Conversely, finding an abnormality does not always establish the final diagnosis. Follow-up may involve another ultrasound, blood tests, CT, MRI, biopsy, or a specialist assessment. Imaging results are therefore best understood as one part of a broader diagnostic process.
Patients should contact the clinician who ordered the scan if they do not understand the result or are unsure about recommended follow-up. Questions can include what the finding means, whether it explains the symptoms, whether additional tests are needed, and how urgently the next step should occur. Online searches can provide general education but may create unnecessary anxiety when medical terminology is interpreted without personal context. The same ultrasound phrase can have very different significance depending on age, symptoms, pregnancy status, previous imaging, and laboratory results. A clinician familiar with the person’s medical history can provide the most meaningful interpretation. Patients should also seek timely care if symptoms worsen regardless of whether imaging has already been performed.
Is Ultrasound Safe? Benefits, Risks, and Practical Limitations
Diagnostic ultrasound is generally regarded as a safe medical imaging method when used appropriately by qualified health professionals. Unlike conventional X-rays and CT scans, ultrasound does not create images using ionizing radiation. This feature makes it particularly useful when repeated imaging may be necessary or when avoiding ionizing radiation is desirable. Standard external ultrasound also usually requires no injection, incision, anesthesia, or recovery period. These advantages help explain why ultrasound is widely used during pregnancy and in children as well as adults. However, “safe” does not mean that ultrasound should be performed endlessly without a medical purpose, because diagnostic energy should still be used thoughtfully and appropriately.
Ultrasound waves transfer energy into body tissues, and medical professionals use equipment settings and examination times appropriate for the diagnostic task. Under certain circumstances, ultrasound energy can produce small temperature changes or mechanical effects within tissues. Diagnostic ultrasound has a strong safety record, but health professionals still aim to obtain necessary information without using unnecessary exposure. This principle is particularly relevant in fetal imaging, where scans should have an appropriate medical purpose and be performed by trained professionals. Long sessions performed only for entertainment or nonmedical keepsake purposes are generally discouraged. The goal is to obtain useful diagnostic information efficiently rather than maximize exposure merely because ultrasound does not use X-rays.
Most physical discomfort associated with a routine ultrasound comes from pressure rather than the sound waves themselves. Pressing the transducer over an already painful abdomen, swollen tissue, or injured joint may temporarily increase tenderness. Internal ultrasound can create pressure or discomfort during insertion and movement of the probe. These sensations usually end when the examination is complete. Patients should tell the sonographer when something hurts significantly because pain can provide useful information and may allow the technique to be adjusted. Ultrasound-guided biopsies, injections, or drainage procedures have additional risks related to the invasive procedure itself, which should be explained separately before treatment.
One of ultrasound’s major benefits is portability. Ultrasound machines range from larger diagnostic systems to compact devices that can be brought to emergency departments, hospital rooms, operating areas, ambulances, clinics, and other care settings. Point-of-care ultrasound allows appropriately trained clinicians to answer focused questions without always transporting a patient to a dedicated imaging department. This can be valuable when rapid information is needed about the heart, lungs, abdomen, blood vessels, pregnancy, or other clinical situations. Point-of-care findings may still need confirmation with comprehensive imaging depending on the circumstances. The usefulness of portable ultrasound depends heavily on training, examination quality, and appropriate interpretation.
Choosing ultrasound is ultimately a balance between the medical question and the capabilities of the imaging technique. It is particularly effective for many soft tissues, fluid-filled structures, blood vessels, pregnancy, superficial anatomy, and real-time procedural guidance. It is less suitable when sound cannot reach the target effectively or when a wider, more detailed view of complex internal anatomy is required. A clinician may therefore start with ultrasound and recommend CT or MRI if the results are incomplete, or choose another test from the beginning when it is better suited to the suspected condition. No single imaging method is best for every medical problem. The safest and most useful examination is the one that appropriately answers the clinical question.
Frequently Asked Questions About Ultrasound
How long does an ultrasound take?
Many routine ultrasound examinations take around 20 to 60 minutes, although the exact duration depends on the body area and complexity of the scan. Detailed pregnancy, vascular, cardiac, or specialized examinations may require additional time.
Is an ultrasound painful?
Most external ultrasound examinations are painless, although pressure from the transducer may be uncomfortable over a tender area. Internal ultrasound can cause temporary pressure or mild discomfort, and patients should tell the health professional if they experience significant pain.
Can I eat before an ultrasound?
It depends on the type of ultrasound being performed. Some abdominal scans require fasting, while many other examinations allow normal eating, so patients should follow the instructions provided specifically for their appointment.
Why do I need a full bladder for some ultrasounds?
A full bladder can improve visualization during certain pelvic or urinary ultrasound examinations by providing a fluid-filled pathway for sound waves. If a full bladder is required, the imaging center will usually provide specific instructions about drinking water and when to avoid urinating.
Does ultrasound use radiation?
Diagnostic ultrasound does not use the ionizing radiation used in X-rays or CT scans. Instead, it creates images using high-frequency sound waves, although examinations should still be performed appropriately and for a valid medical purpose.
