A small amount of a radioactive compound is injected into your vein for this test. The kidneys excrete this compound into the urine. A specialised camera is then used to take pictures (scans) of your kidneys.
If a Captopril renal study is required, you may be asked by your doctor to stop taking ACE inhibitors (e.g. Capoten, Renitec) for several days before the scan. Otherwise, take all of your usual medications.
You should fast for four hours before the scan if you are having a Captopril Study. Otherwise, there is no need to fast for the test. You should drink plentiful fluids prior to the test.
The test is usually not performed in pregnant women, so please inform us before the test begins if you know that you are (or think you might be) pregnant.
Images are taken for about 45 minutes.
After the test is explained to you, a needle will be placed into a vein in your arm (usually near the elbow), and a radioactive compound will be administered. Images are taken for about 45 minutes.
A diuretic (lasix) may be administered intravenously to assess washout from the renal tracts to look for obstructions.
There are no side effects or reactions from the injection. The injection does NOT contain iodine and is safe for people who are allergic to radiological contrast injections. Although you will be required to keep still during the scan, the procedure is entirely painless. There is no need to hold your breath during the test.
In general, the scans and results are sent to your doctor the next working day.
You can drive home after the scan. You will not be drowsy in any way.
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