Serum/Plasma Creatinine Concentration (Mass Concentration)

Why This Test Matters

Your kidneys normally filter waste products, including creatinine, from your blood. High levels of creatinine can signal poor kidney function, while low levels might indicate overhydration or other conditions. This test helps doctors monitor kidney health, especially if you have conditions like diabetes, high blood pressure, or a history of kidney disease.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the test if it involves drawing blood. Stay hydrated unless instructed otherwise. Avoid strenuous activity or medications that may affect kidney function before the test.

Common Causes of Abnormal Results

High creatinine levels may indicate reduced kidney function, dehydration, or conditions like heart failure or severe muscle breakdown. Low levels could suggest overhydration, low muscle mass, or certain medications. Always discuss results with your healthcare provider.

How This Test Is Performed

A healthcare professional will draw blood from a vein in your arm using a small needle. The blood sample is sent to a lab for analysis. The test typically takes a few minutes, and you may feel slight discomfort but no lasting effects.