Creatinine in Urine (24-hour collection)

Why This Test Is Done

Your doctor may order this test if they suspect kidney disease, monitor kidney function in chronic conditions (like diabetes or high blood pressure), or check for conditions affecting fluid balance. It’s also used to diagnose or monitor certain metabolic disorders.

What to Expect Before the Test

You’ll need to collect all urine for 24 hours, starting after your first morning pee and ending with your first pee the next day. Store samples in a refrigerator and bring the full collection to your lab. Follow your doctor’s specific instructions carefully to ensure accurate results.

How the Test Works

Your urine is collected in a container, and the creatinine levels are measured using a specialized lab technique. The test quantifies how much creatinine is excreted, which reflects kidney function and fluid balance.

What the Results Mean

Results are typically compared to your body weight and other health factors. Elevated levels may indicate kidney problems, dehydration, or conditions that increase muscle breakdown. Lower levels could suggest overhydration or kidney impairment.