Serum or Plasma Creatinine Concentration (Standard Method)

Why This Test Matters

Creatinine levels can indicate how efficiently your kidneys are working. High levels may suggest kidney damage or disease, while low levels could be due to muscle mass changes or other conditions. This test is often used alongside other measures to monitor kidney health, especially in people with risk factors like diabetes or hypertension.

What to Expect Before the Test

No special preparation is needed for this test. You may have a blood draw (serum or plasma) or, less commonly, a urine sample (though the slug suggests serum/plasma). If you’re on a low-protein diet, discuss it with your provider, as it may affect results.

Common Causes of Abnormal Results

Elevated creatinine levels may be caused by reduced kidney function, dehydration, severe muscle injury, or certain medications. Low levels might result from muscle atrophy, overhydration, or conditions like liver disease. Always discuss symptoms or medications with your healthcare team.

How Results Are Interpreted

Results are typically compared to your baseline or clinical context rather than absolute reference ranges. Your provider will use them alongside other tests (like blood urea nitrogen or glomerular filtration rate) to assess kidney function.