What is Creatinine Clearance Test?
A creatinine clearance test is a medical laboratory test that assesses the glomerular filtration rate (GFR) or your kidney's health. It estimates how much creatinine, a metabolic by-product from muscle, is being filtered by your kidney. A high level of creatinine may indicate kidney dysfunction or kidney disease.
Types of Creatinine Clearance Test
There are two types of creatinine clearance tests:
- A 24-hour urine creatinine clearance test
- A serum creatinine clearance test
Preparation for Creatinine Clearance Test
Your doctor will ask you to discontinue any medications that may affect test results. These include diuretics and any medications that are excreted by the kidneys.
Procedure for Creatinine Clearance Test
The procedure for a creatinine clearance test depends on which type of test you are having.
- If you are having a 24-hour urine creatinine clearance test, you will need to collect all of your urine for the 24-hour period before the test.
- If you are having a serum creatinine clearance test, a blood sample will be taken.
Why is a Creatinine Clearance Test Performed?
Creatinine is produced in the body as a byproduct of muscle metabolism. It is then filtered through the kidneys and expelled from the body. If the kidneys are not functioning properly, the level of creatinine in the blood increases. This test can help to identify whether you have any issues with your kidney function. It is often requested if there are signs or symptoms of kidney disease, such as swelling in the ankles or puffiness around the eyes, or if there is a family history of kidney disease.
When to Get a Creatinine Clearance Test
Your doctor may suggest a creatinine clearance test if you are showing any signs or symptoms of kidney disease, such as swelling in the ankles or puffiness around the eyes, or if there is a family history of kidney disease. They may also suggest a test if you are taking medication that can affect your kidney function. In some cases, you may need to have this test regularly as part of a chronic health condition.
Risks of Creatinine Clearance Test
The risks associated with this test are minimal. There may be some minor discomfort associated with the blood sample. There may also be some minor areas of soreness around the area where the needle is inserted into your arm.