Serum or Plasma Creatinine Concentration (Qualitative or Quantitative)

Why Your Kidneys Matter

Kidneys filter waste and excess substances from your blood, including creatinine. When kidneys don’t work well, creatinine builds up, which can signal kidney damage or disease. This test is often used alongside other measures to monitor kidney health, especially in people with risk factors like diabetes or high blood pressure.

What to Expect During the Test

A blood sample is taken from a vein, usually in your arm. You may feel a small pinch, but it’s quick. No special preparation is needed unless your doctor instructs otherwise. The test may be done as part of a routine check or to investigate symptoms like fatigue, swelling, or changes in urine.

Common Uses for This Test

Doctors use creatinine levels to diagnose or monitor kidney disease, track progress of treatments, or check for kidney problems in people with conditions like diabetes or heart disease. It’s also part of a broader panel to evaluate overall health, especially in older adults or those with chronic illnesses.

Factors That Can Affect Results

Several factors can influence creatinine levels, including muscle mass (higher muscle = higher creatinine), dehydration, diet (especially protein intake), and certain medications. If you’ve had recent exercise, ate a high-protein meal, or are dehydrated, your results might be temporarily higher. Always discuss these with your doctor.