Serum Creatinine (Creatinine Level)

Why This Test Matters

Creatinine is a byproduct of muscle metabolism that your kidneys filter out of your blood. High levels can signal kidney problems, while low levels might indicate dehydration or other conditions. This test is often used alongside other kidney function tests to monitor overall kidney health.

What to Expect Before the Test

No special preparation is needed for this blood test. You may have a small needle inserted into your arm to draw a blood sample. If you’re on a low-protein diet or have recently exercised heavily, let your healthcare provider know, as these can temporarily affect creatinine levels.

What the Results Mean

Results are typically reported in milligrams per deciliter (mg/dL). While reference ranges vary by lab, higher-than-normal levels may suggest kidney issues, while very low levels could raise concerns about hydration or muscle metabolism. Your doctor will interpret results in the context of your overall health.

Common Causes of Abnormal Results

High creatinine levels may be linked to kidney disease, dehydration, severe muscle damage, or conditions like heart failure or diabetes. Low levels might be due to dehydration, low muscle mass, or certain medications. Always discuss symptoms or concerns with your doctor.