Sonography, also called ultrasound, uses high-frequency sound waves to create real-time images of structures inside the body. It does not use ionising radiation. Ultrasound is used for many different examinations, and the preparation varies according to the body area being assessed.<\/p>\n
Depending on the clinical indication, ultrasound may help evaluate abdominal and pelvic organs, pregnancy, soft tissues, the thyroid and blood flow. Doppler ultrasound is a specialised technique used to assess movement of blood in vessels. Your doctor will specify the examination that matches the clinical question.<\/p>\n
Some abdominal examinations require fasting, while some pelvic examinations require a comfortably full bladder. Other scans need no special preparation. Confirm the instructions when booking because following the correct preparation can improve image quality and may prevent a repeat visit.<\/p>\n
You will usually lie on an examination table while a trained professional applies water-based gel to the skin and moves a handheld transducer over the area. The gel helps transmit sound waves. You may be asked to change position or hold your breath briefly. The examination is generally non-invasive, although mild pressure may be needed to obtain the required views.<\/p>\n
A radiologist reviews the images and prepares a report for your referring clinician. Ultrasound findings should be interpreted together with symptoms, medical history and other investigations.<\/p>\n