Serum Creatinine (with optional 24-hour urine collection for creatinine clearance calculation)

Why This Test Is Done

Your doctor may order this test to evaluate kidney health, monitor chronic kidney disease, detect early kidney problems, or assess kidney function before certain procedures or surgeries. It can also help determine if you need dialysis or other kidney support.

What to Expect Before the Test

For a blood test, you’ll typically have a small needle inserted into your arm to draw blood. If a 24-hour urine sample is needed, you’ll collect all urine for a full day. Avoid strenuous activity or certain medications that might affect results for 24 hours before testing.

What the Results Mean

Higher-than-normal levels may indicate reduced kidney function, dehydration, or conditions like diabetes or heart disease. Lower-than-normal levels might suggest overhydration or muscle breakdown. Your doctor will interpret results in the context of your overall health.

Common Causes of Abnormal Results

Abnormal creatinine levels can result from kidney disease, dehydration, severe muscle injury, or certain medications. Chronic conditions like diabetes or high blood pressure may also affect kidney function over time.