The sound waves are at too high of a pitch for the human ear to hear. Those echoes are then reflected back into a computer. The waves echo as they hit a dense object, such as an organ or bone. The transducer sends high-frequency sound waves through your body. The jelly also helps transmit the sound waves. ![]() The transducer has a similar appearance to a microphone. This prevents friction so they can rub the ultrasound transducer on your skin. You will most likely be lying down on a table with a section of your body exposed for the test.Īn ultrasound technician, called a sonographer, will apply a special lubricating jelly to your skin. For this reason, they are the preferred method for examining a developing fetus during pregnancy.īefore the exam, you will change into a hospital gown. Unlike X-rays or CT scans, ultrasounds use no radiation. It’s important to follow your doctor’s instructions and ask any questions you may have before the procedure.Īn ultrasound carries minimal risks. For other examinations, you may be asked to drink a lot of water and to hold your urine so that your bladder is full and better visualized.īe sure to tell your doctor about any prescription drugs, over-the-counter medications, or herbal supplements that you take before the exam. However, you can continue to drink water and take any medications as instructed. Undigested food can block the sound waves, making it difficult for the technician to get a clear picture.įor an examination of the gallbladder, liver, pancreas, or spleen, you may be told to eat a fat-free meal the evening before your test and then to fast until the procedure. Your doctor may tell you to fast for eight to 12 hours before your ultrasound, especially if your abdomen is being examined. The steps you will take to prepare for an ultrasound will depend on the area or organ that is being examined.
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