Serum Creatinine Concentration (Mass Concentration)

Why This Test Matters

Creatinine is a byproduct of muscle metabolism that your kidneys filter out of your blood. High levels can indicate poor kidney function, while low levels might suggest dehydration or muscle loss. This test is often used alongside other kidney function tests, like blood urea nitrogen (BUN), to get a full picture of kidney health.

What to Expect Before the Test

No special preparation is needed for this test. You may have a small needle inserted into your arm to draw blood. If you’re on a low-protein diet or have had recent muscle activity, your doctor may advise adjustments to avoid misleading results.

Common Reasons for Testing

Doctors order creatinine tests to monitor kidney function, especially if you have symptoms like swelling, fatigue, or changes in urine output. It’s also used during pregnancy, before surgeries, or when managing conditions like diabetes or heart disease.

What the Results Mean

Results are compared to your body’s size (height/weight) and overall health. High levels may signal kidney problems, while very low levels could indicate dehydration or muscle wasting. Your doctor will interpret results in the context of your medical history and other tests.