Serum Creatinine (Creatinine Level)

Why This Test Matters

Creatinine is a byproduct of muscle breakdown and is normally filtered out of your blood by your kidneys. High levels can indicate kidney problems, while low levels might suggest dehydration or other conditions. This test is often used alongside other measures, like blood urea nitrogen (BUN), to evaluate kidney function.

What to Expect Before the Test

No special preparation is needed for this test. You may have a small needle inserted into a vein (usually in your arm) to draw a blood sample. This is quick and usually painless. If you’re dehydrated or have very low blood pressure, your doctor may advise you to drink extra fluids the day before.

Common Causes of Abnormal Results

High creatinine levels may suggest kidney disease, muscle disorders, or conditions that reduce blood flow to the kidneys. Low levels could indicate dehydration, overhydration, or certain medical conditions that affect muscle metabolism. Your doctor will consider your overall health and other test results when interpreting these results.

How Results Are Interpreted

Your doctor will compare your creatinine level to what’s typical for healthy adults of your age, sex, and size. They’ll also look at other factors, like your medical history and symptoms, to understand what your results mean for you.