A renal artery exam uses ultrasound to look for narrowing of the arteries that supply blood to your kidneys.  During this exam you will lie on your back and may be asked to roll onto your right or left side.  You may also be asked to take a deep breath in and hold it for a short time.

You will need to follow the following Fasting Instructions:

Q: Why can’t I eat or drink anything before my abdominal ultrasound?

A: When you eat, drink, or even chew gum, you swallow air into the stomach and bowel. Sound waves do not penetrate air, making it harder to see the blood vessels. While some air is always present in the bowel, fasting before the exam ensures the best scan possible.

Fasting instructions for all non-diabetic patients:

• Nothing to eat or drink (water is ok) for 8 hours before your ultrasound.
• You may take ALL of your regular medications.
• Do not take any vitamins, fiber pills/powder, chew gum or smoke tobacco.

Instructions for all diabetic patients:

• Nothing to eat or drink (water is ok) for 6 hours before your ultrasound.  If you are unable to fast, please eat a low-fat diet (like toast, fruit or juice).  No dairy products or beverages with caffeine.
• You may take ALL of your regular medications.
• Do not take any vitamins, fiber pills/powder, chew gum or smoke tobacco.