Serum or Plasma Creatinine Concentration (Standard Method)

Why This Test Matters

Creatinine levels can indicate how well your kidneys are working. High levels may suggest kidney problems, while low levels could indicate 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 before this test, but it’s not always required. Drink plenty of water the day before if you’re dehydrated. Avoid heavy exercise or certain medications that could affect results. Your blood will be drawn from a vein, usually in your arm.

What the Results Mean

Results are compared to a general reference range, but individual ranges can vary by lab. High creatinine levels may signal kidney issues, while very low levels might need further investigation. Your doctor will discuss results in the context of your overall health.

Common Causes of Abnormal Results

High creatinine levels can result from kidney disease, dehydration, or conditions that reduce blood flow to the kidneys. Low levels may occur with muscle wasting, severe dehydration, or certain medications. Other factors like age, sex, and muscle mass can also influence results.