Creatinine Clearance (Renal Function)

What Is Creatinine Clearance Used For?

Creatinine clearance is primarily used to evaluate kidney function by estimating how efficiently your kidneys remove creatinine, a waste product from muscle metabolism. It’s a key indicator of glomerular filtration rate (GFR), which reflects overall kidney health. Unlike blood creatinine alone, this test considers urine volume and timing, providing a more comprehensive picture of kidney performance.

How Is the Test Performed?

To perform this test, you’ll provide a 24-hour urine sample and a blood sample. The urine is collected over a full day, while the blood sample is taken at the end of the collection period. Your healthcare provider will guide you on proper urine collection timing and storage to ensure accurate results.

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 changes in urine), if you have a condition that affects kidney function (like diabetes or high blood pressure), or if you’re preparing for certain treatments that could impact kidney health. It’s also used to monitor kidney function in chronic conditions.

What Does the Result Mean?

Results are typically expressed in milliliters per minute (mL/min). Lower than expected values may indicate reduced kidney function, while higher values might suggest overhydration or other factors. Your doctor will interpret the result in relation to your overall health and medical history.