Serum Creatinine Concentration (Mass Concentration)

Why This Test Matters

Creatinine is a byproduct of muscle metabolism that the kidneys filter out of your blood. High levels can indicate poor kidney function, while low levels may suggest overhydration or other conditions. This test is often used alongside other measures to evaluate kidney health, especially in people with risk factors like diabetes, high blood pressure, or a family history of kidney disease.

How the Test Works

A small blood sample is drawn from your arm. The lab then uses a specialized method (likely enzymatic or nephelometric) to measure the concentration of creatinine in your serum. Results are reported in units of mass concentration (e.g., mg/dL or µmol/L), though exact ranges vary by lab.

Common Reasons for Testing

Your doctor may order this test if you have symptoms like swelling, frequent urination, fatigue, or if you’re at risk for kidney problems. It’s also part of routine check-ups for people with chronic conditions like diabetes or high blood pressure.

Possible Results and Next Steps

Results may be compared to your baseline or reference ranges provided by your lab. If levels are unusually high, your doctor may recommend further testing or adjustments to your treatment plan, such as monitoring blood pressure or fluid intake.