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Ultrasound is used for many reasons, including to: View the uterus and ovaries during pregnancy and monitor the developing baby's health. Diagnose gallbladder disease. Evaluate blood flow.

mayoclinic.org - Ultrasound - Mayo Clinic

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Overview

Diagnostic ultrasound, also called sonography or diagnostic medical sonography, is an imaging method that uses sound waves to produce images of structures within your body. The images can provide valuable information for diagnosing and directing treatment for a variety of diseases and conditions. Most ultrasound examinations are done using an ultrasound device outside your body, though some involve placing a small device inside your body.

Why it's done

Ultrasound is used for many reasons, including to:

View the uterus and ovaries during pregnancy and monitor the developing baby's health

Diagnose gallbladder disease

Evaluate blood flow

Guide a needle for biopsy or tumor treatment

Examine a breast lump

Check the thyroid gland

Find genital and prostate problems

Assess joint inflammation (synovitis)

Evaluate metabolic bone disease

Risks

Diagnostic ultrasound is a safe procedure that uses low-power sound waves. There are no known risks. Ultrasound is a valuable tool, but it has limitations. Sound waves don't travel well through air or bone, so ultrasound isn't effective at imaging body parts that have gas in them or are hidden by bone, such as the lungs or head. Ultrasound may also be unable to see objects that are located very deep in the human body. To view these areas, your health care provider may order other imaging tests, such as CT or MRI scans or X-rays.

How you prepare

Most ultrasound exams require no preparation. However, there are a few exceptions:

For some scans, such as a gallbladder ultrasound, your care provider may ask that you not eat or drink for a certain period of time before the exam. Others, such as a pelvic ultrasound, may require a full bladder. Your doctor will let you know how much water you need to drink before the exam. Do not urinate until the exam is done. Young children may need additional preparation. When scheduling an ultrasound for yourself or your child, ask your doctor if there are any specific instructions you'll need to follow.

Clothing and personal items

Wear loose clothing to your ultrasound appointment. You may be asked to remove jewelry during your ultrasound, so it's a good idea to leave any valuables at home.

What you can expect

Before the procedure

Ultrasound of breast cyst Open pop-up dialog box Close Ultrasound of breast cyst Ultrasound of breast cyst This ultrasound shows a breast cyst. Ultrasound of liver tumor Open pop-up dialog box Close Ultrasound of liver tumor Ultrasound of liver tumor An ultrasound uses sound waves to create an image. This ultrasound shows a noncancerous (benign) liver tumor. Ultrasound of gallstones Open pop-up dialog box Close Ultrasound of gallstones Ultrasound of gallstones This ultrasound shows gallstones in the gallbladder. Ultrasound of needle-guided procedure Open pop-up dialog box Close Ultrasound of needle-guided procedure Ultrasound of needle-guided procedure These images show how ultrasound can help guide a needle into a tumor (left), where material is injected (right) to destroy tumor cells. Transvaginal ultrasound Open pop-up dialog box Close Transvaginal ultrasound Transvaginal ultrasound During a transvaginal ultrasound, you lie on an exam table while a health care provider or a medical technician puts a wandlike device, known as a transducer, into the vagina. Sound waves from the transducer create images of the uterus, ovaries and fallopian tubes.

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Before your ultrasound begins, you may be asked to do the following:

Remove any jewelry from the area being examined.

Remove or reposition some or all of your clothing.

Change into a gown.

You'll be asked to lie on an examination table.

During the procedure

Gel is applied to your skin over the area being examined. It helps prevent air pockets, which can block the sound waves that create the images. This safe, water-based gel is easy to remove from skin and, if needed, clothing. A trained technician (sonographer) presses a small, hand-held device (transducer) against the area being studied and moves it as needed to capture the images. The transducer sends sound waves into your body, collects the ones that bounce back and sends them to a computer, which creates the images. Sometimes, ultrasounds are done inside your body. In this case, the transducer is attached to a probe that's inserted into a natural opening in your body. Examples include: Transesophageal echocardiogram. A transducer, inserted into the esophagus, obtains heart images. It's usually done while under sedation. A transducer, inserted into the esophagus, obtains heart images. It's usually done while under sedation. Transrectal ultrasound. This test creates images of the prostate by placing a special transducer into the rectum. This test creates images of the prostate by placing a special transducer into the rectum. Transvaginal ultrasound. A special transducer is gently inserted into the vagina to look at the uterus and ovaries. Ultrasound is usually painless. However, you may experience mild discomfort as the sonographer guides the transducer over your body, especially if you're required to have a full bladder, or inserts it into your body.

A typical ultrasound exam takes from 30 minutes to an hour.

Results

When your exam is complete, a doctor trained to interpret imaging studies (radiologist) analyzes the images and sends a report to your doctor. Your doctor will share the results with you. You should be able to return to normal activities immediately after an ultrasound.

Clinical trials

Explore Mayo Clinic studies of tests and procedures to help prevent, detect, treat or manage conditions.

mayoclinic.org - Ultrasound - Mayo Clinic

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