What is Renal Scan?
A renal scan is a nuclear medicine exam in which a small amount of radioactive material (radioisotope) is used to measure the function of the kidneys.
Alternative names
Renogram; Kidney scan
How the Test is Performed
The specific type of scan may vary, depending on the patient's specific needs. This article provides a general overview. A renal scan is similar to a renal perfusion scintiscan . It may be done along with that test. You will be asked to lie on the scanner table. The health care provider will place a tourniquet or blood pressure cuff to the upper arm, which creates pressure and enlarges your arm veins. The inner elbow is scrubbed with numbing medicine (antiseptic) and a small amount of ...
What is Renal Scan?
A renal scan is a nuclear medicine exam in which a small amount of radioactive material (radioisotope) is used to measure the function of the kidneys.
Alternative names
Renogram; Kidney scan
How to Prepare for the Test
Tell your health care provider if you take any nonsteroidal anti-inflammatory drugs (NSAIDs) or blood pressure medications, as some could interfere with the exam.
You may be asked to drink additional fluids before the scan.
You must sign a consent form.
You will be asked to wear a hospital gown. Remove jewelry, dentures, and metallic objects before the scan.
How the Test Will Feel
There is a sharp prick when the isotope is injected into the vein. You do not feel the isotope. You do not feel the scan, although the table may be hard or cold. You will need to lie still during the scan.
Why the Test is Performed
A renal scan reveals the size, position, shape, and function of the kidneys. It is particularly useful when a person is sensitive or allergic to the contrast (dye) material used in an IVP or other x-rays, or when they have reduced kidney function.
A renal scan is commonly performed after a kidney transplant to check kidney function and to look for signs of transplant rejection.
It may also be done on those with high blood pressure to check kidney function.
What Abnormal Results Mean
Abnormal results are a sign of reduced kidney function. This may be due to:
Additional conditions under which the test may be performed:
Risks
There is a slight amount of radiation from the radioisotope. Most of this radiation exposure occurs to the kidneys and bladder as the isotope is removed from the body. Virtually all radiation is gone from the body in 24 hours. However, because of the slight exposure to radiation, caution is advised if you are pregnant or breastfeeding.
Extremely rarely, a person will exhibit an allergic reaction to the radioisotope, which may include severe anaphylaxis.
Risks related to a needle stick include:
Considerations
Problems with the kidney structure may lead to an inaccurate reading of the scans, since results are calculated based on normal kidney size and shape.
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Review Date: 10/2/2008
Reviewed By: Louis S. Liou, MD, PhD, Assistant Professor of Urology, Department of Surgery, Boston University School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
Posted On November 12, 2007 04:11:29 PM
Posted On November 14, 2007 02:48:28 PM
