Plasma or Serum Creatinine Concentration (Mass Concentration)

Why This Test Matters

Creatinine levels can indicate how efficiently your kidneys are removing waste from your blood. High levels may signal kidney problems, while low levels could suggest dehydration or muscle loss. This test is often used alongside other kidney function tests to diagnose or monitor conditions like chronic kidney disease.

What to Expect Before the Test

You may be asked to fast for a few hours before the test, though this isn’t always required. Bring any medications you’re currently taking, as some (like certain pain relievers) can affect results. Avoid heavy exercise or strenuous activity 24 hours before testing to ensure accurate readings.

How the Test Is Performed

A healthcare provider will draw blood from a vein in your arm using a small needle. The blood sample is then sent to a lab for analysis. The process usually takes a few minutes and may cause a slight pinch or discomfort.

What the Results Mean

Results are typically reported in milligrams per deciliter (mg/dL) or micromoles per liter (µmol/L). While reference ranges vary by lab, higher-than-normal levels may signal kidney issues, while very low levels might warrant further investigation for other health concerns.