Serum Creatinine (with Electrolyte Measurement)

Why This Test Matters

Creatinine is a byproduct of muscle breakdown and is normally filtered out by your kidneys. High levels may indicate kidney problems, while low levels could suggest dehydration or muscle issues. This test is often used alongside other kidney function tests to monitor overall kidney health.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the test if it’s part of a larger panel. Drink plenty of water the day before to ensure proper hydration levels. Avoid heavy exercise or strenuous activity on the day of testing.

What to Expect During the Test

A healthcare provider will draw blood from a vein in your arm using a small needle. You may feel a slight pinch, but it usually takes only a few seconds. The test itself is quick, and you can resume normal activities afterward.

Possible Results and What They Mean

Results are typically reported in milligrams per deciliter (mg/dL). While specific reference ranges vary by lab, higher-than-normal levels may signal kidney issues, while lower levels might raise concerns about dehydration or muscle wasting. Always discuss your results with your healthcare provider.