Creatinine Clearance (from Serum Creatinine and Estimated Glomerular Filtration Rate)

What Is Creatinine Clearance Used For?

Creatinine clearance is primarily used to evaluate kidney function and diagnose or monitor kidney disease. It can also help determine how well a patient is responding to treatments for conditions like chronic kidney disease or kidney damage.

How Is This Test Performed?

For this test, a blood sample is taken from a vein in your arm. The lab measures your serum creatinine level. Along with your height and weight, this value is used in a formula (often the Cockcroft-Gault or CKD-EPI equation) to estimate your creatinine clearance rate.

Why Might You Need This Test?

You may need a creatinine clearance test if your doctor suspects kidney problems, such as chronic kidney disease, kidney stones, or other conditions affecting kidney function. It’s also used before surgeries or procedures that may impact kidney function, or if you’re taking medications that can affect kidney health.

What Does a Low or High Clearance Mean?

A lower than expected clearance may indicate reduced kidney function, which could be due to kidney disease, dehydration, or other health issues. A higher clearance might suggest overhydration or conditions that temporarily increase kidney filtration, but this is less common and usually requires further evaluation.