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 wasting. This test is often used alongside other measures like blood pressure and urine tests to monitor kidney health, especially in people with diabetes, high blood pressure, or a family history of kidney disease.

What to Expect Before the Test

No special preparation is needed for this test. You may have a small needle inserted into a vein in your arm, and a small amount of blood will be drawn. If you’re on a low-protein diet or have recently exercised, let your healthcare provider know, as these factors can temporarily affect creatinine levels.

What the Results Mean

Results are typically reported in milligrams per deciliter (mg/dL) or micromoles per liter (µmol/L). While exact reference ranges vary by lab, higher-than-normal levels may signal reduced kidney function, while very low levels might raise concerns about hydration or muscle issues. Your doctor will interpret results in the context of your overall health and medical history.

Common Causes of Abnormal Results

Creatinine levels can be affected by factors like dehydration, muscle mass, diet, or kidney disease. High levels may also occur in conditions like heart failure or severe infections, while low levels can happen with overhydration or certain medications. Your doctor will discuss any changes with you based on your specific situation.