Ultrasound
Reviewed
An ultrasound (sonogram) is an imaging test that uses sound waves to create pictures of organs, tissues, and other structures inside your body. It is commonly used to monitor pregnancy, diagnose medical conditions, and guide biopsies. Results are interpreted by your healthcare provider.
Preparation and collection
Preparation varies depending on the body part being examined. Some exams require no preparation; others may require a full bladder (e.g., for urinary tract imaging) or fasting for several hours. Your provider will give specific instructions.
Understanding this test
Use the reference interval and units printed by the laboratory that performed the test. A result outside that interval is not a diagnosis by itself, and a result inside it does not rule out every condition. Your symptoms, history, medicines, timing, and related tests can change what the result means.
- Ultrasound has not been linked to any health harms when used correctly by trained sonographers, but it can affect fluids and tissues in certain cases, so it is recommended only when needed to provide important medical information.
- An ultrasound cannot guarantee a healthy baby or rule out all conditions.
What to do next
Your healthcare provider will explain what your results mean for your health and recommend any necessary follow-up.