Creatinine Clearance (from forearm muscle)

Why Is This Test Done?

Your doctor may order this test if they suspect kidney problems, need to monitor kidney function after a medical event (like surgery or injury), or evaluate blood flow in your arms. It can also help diagnose conditions affecting kidney function or circulation.

How Is the Sample Collected?

A healthcare provider will collect urine samples over a 24-hour period, typically starting and ending at the same time each day. You’ll be given instructions on when and how to collect your urine, including emptying your bladder at the start and end of the period. Blood may also be drawn at specific times to measure creatinine levels.

What Does the Test Result Mean?

Results are compared to your body size and overall health to estimate kidney function. Lower than expected results may indicate poor kidney function or reduced blood flow, while higher results could suggest overhydration or other conditions. Your doctor will interpret the results in the context of your medical history and other tests.

Common Reasons for Testing

This test is often used to diagnose chronic kidney disease, evaluate kidney function after trauma or surgery, assess blood flow issues in the arms, or monitor conditions like diabetes or heart disease that can affect kidney function.