Definition of Renal perfusion scintiscan:

A renal perfusion scintiscan is a nuclear medicine test that uses a small amount of a radioactive substance to create an image of the kidneys.

How the test is performed:

You will be asked to take a blood pressure medicine called an ACE inhibitor. The drug may be taken by mouth, or given through a vein (IV). The medicine increases the accuracy of the test.

You lie on the scanner table shortly after taking the medicine. The health care provider will inject a small amount of radioactive material (radioisotope) into one of your veins. Images of your kidneys are taken as the radioactive material flows through the arteries in the area. It is very important to remain still for the entire test. The scan takes about 30 minutes.

About 10 minutes after you receive the radioactive material, you will be given a a diuretic ("water pill") through a vein. This medicine also increases the test's accuracy.

You can return to normal activities immediately after the test. You should drink plenty of fluids to help remove the radioactive material from your body.

How to prepare for the test:

You will be asked to drink plenty of water before the test.

If you are currently taking an ACE inhibitor for high blood pressure, you may be asked to stop taking your medication before the examination. Always consult with your health care provider before stopping any medication.

You may be asked to wear a hospital gown. Remove all jewelry and metallic objects before the scan.

How the test will feel:

You may feel a small amount of pain when the needle is inserted.

You must remain still during the scan. You will be instructed by the technologist when to change positions.

There may be some discomfort as your bladder fills with urine during the examination. Inform the technologist if you must urinate before the completion of the scan.

Why the test is performed:

The test evaluates blood flow to the kidneys. It is used to diagnose narrowing of the arteries that supply the kidneys, a condition called renal artery stenosis. Significant renal artery stenosis may be a cause of high blood pressure and kidney problems.