Serum Creatinine (Creatinine Level)

What Is Creatinine?

Creatinine is a byproduct of muscle breakdown that your kidneys normally filter out of your blood. High levels may indicate kidney problems, while low levels could suggest muscle disorders or other conditions. This test is often used alongside other kidney function tests to get a full picture.

Why Might You Need This Test?

Your doctor may order a creatinine test to evaluate kidney health, especially if you have symptoms like swelling, fatigue, or changes in urine output. It’s also used before surgeries, during pregnancy, or if you have conditions like diabetes or high blood pressure that affect kidney function.

How Is the Test Done?

A blood sample is taken from a vein in your arm. The sample is sent to a lab where it’s analyzed to measure creatinine levels. No special preparation is usually needed, but you may be asked to avoid certain medications or foods for a short time if instructed by your doctor.

What Are Common Results?

Results are compared to a general reference range, though individual ranges can vary. High creatinine levels may signal impaired kidney function, while very low levels might warrant further investigation into muscle health or other conditions.