Doppler ultrasound can be used to detect areas of narrowing in the arteries leading to the brain, the abdominal organs or the extremities. Doppler ultrasound can also be used to detect blood clots within veins which are potentially life threatening abnormalities. Special preparations You may be asked to follow certain instructions to best prepare for your ultrasound exam. The instructions will vary depending on the information your doctor needs and the type of exam you will have. Many exams require no preparation at all.
Eating makes the gallbladder shrink and makes it harder to see small gallstones.
The larger upper abdominal organs such as the liver, spleen and kidneys are less affected by eating and are generally well seen whether you have fasted or not. Your bladder should be full but not uncomfortable. For most women, this means drinking a few glasses of water during the hour leading up to your exam. It is performed with a small ultrasound probe placed in the vagina, often after the routine transabdominal pelvic exam. The transvaginal pelvic exam doesn't let us see very far into the pelvis, but the resolution of what we do see may be better.