Serum or Plasma Creatinine Concentration (Standard Method)

Why Is This Test Done?

Your doctor may order this test to check for kidney disease, monitor kidney function in chronic conditions (like diabetes or high blood pressure), or evaluate symptoms such as swelling, fatigue, or changes in urine output. It’s also used before certain procedures to ensure your kidneys are working properly.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8–12 hours before the test if it’s part of a broader panel. Drink plenty of water the day before to help dilute your urine if you’re having a urine-based test (though this test is blood-based). Avoid heavy exercise or supplements that could affect results.

What Happens During the Test?

A healthcare provider will draw blood from a vein in your arm. The process is quick and usually painless. You may feel a slight pinch, but most people tolerate it well. The blood sample is sent to a lab for analysis.

What Does the Test Result Mean?

Results are compared to a reference range provided by your lab. High levels may indicate kidney problems, while very low levels could suggest muscle disorders or other conditions. Your doctor will interpret the result in the context of your overall health and symptoms.