Serum or Plasma Creatinine Concentration (Standard Method)

Why This Test Matters

Your kidneys normally filter waste products, including creatinine, from your blood. High levels of creatinine can signal impaired kidney function, while low levels may indicate dehydration or other conditions. This test is often used alongside other measures to monitor kidney health, especially in people with risk factors like diabetes, high blood pressure, or a family history of kidney disease.

What to Expect Before the Test

You may be asked to fast for a few hours before the test, but this is not always required. Drink plenty of water the day before if you suspect dehydration. Avoid strenuous exercise or certain medications that could affect kidney function, but always follow your healthcare provider’s specific instructions.

During the Test

A healthcare professional will draw blood from a vein in your arm. You may feel a slight pinch or discomfort, but it usually takes only a few minutes. If you’re concerned about needles, let your provider know so they can offer alternatives.

What the Results Mean

Results are compared to a reference range, which can vary slightly by lab. High creatinine levels may indicate kidney problems, while very low levels might suggest dehydration or other conditions. Your doctor will interpret results in the context of your overall health and medical history.