Serum Creatinine (Creatinine Level)

Why This Test Matters

Creatinine is a byproduct of muscle breakdown and is normally filtered out of your blood by your kidneys. High levels can indicate kidney problems, while low levels may suggest dehydration or muscle loss. This test is often used alongside other measures to evaluate kidney health, especially if you have symptoms like swelling, fatigue, or changes in urine output.

What to Expect Before the Test

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

What the Results Mean

Results are compared to a reference range, which can vary slightly by lab. Higher-than-normal levels may signal kidney issues, while very low levels could point to conditions like severe dehydration or muscle wasting. Your doctor will interpret results in the context of your overall health.

Common Causes of Abnormal Results

High creatinine levels may be caused by kidney disease, dehydration, severe muscle injury, or conditions that reduce blood flow to the kidneys. Low levels might result from dehydration, low muscle mass, or certain medications. Other factors, like pregnancy or liver disease, can also influence results.