Creatinine Clearance (Total)

What Is Creatinine Clearance Used For?

Creatinine clearance is primarily used to evaluate kidney function and diagnose or monitor kidney disease. It also helps determine how well your kidneys are filtering waste products from your blood, which is essential for overall kidney health. This test can be particularly useful in cases where other kidney function tests, like blood urea nitrogen (BUN) or serum creatinine alone, may not provide enough information.

How Is This Test Performed?

To calculate creatinine clearance, your healthcare provider will typically collect a 24-hour urine sample. This involves collecting all urine produced over a full day. Blood may also be drawn to measure baseline creatinine levels. The test measures how much creatinine is excreted in urine compared to the amount remaining in the blood.

Why Might You Need This Test?

You may need a creatinine clearance test if you have symptoms of kidney problems, such as swelling, fatigue, or frequent urination. It may also be ordered before surgeries, to monitor chronic kidney disease, or to check if medications are being properly cleared by your kidneys.

What Are the Preparation Instructions?

There are usually no strict dietary restrictions for the urine collection part of this test. However, you should avoid excessive alcohol and certain medications that might affect kidney function. Follow your healthcare provider’s specific instructions for the timing and collection of urine samples accurately.