Creatinine is a waste product produced by muscles during normal metabolism and filtered by the kidneys into urine. It is measured in blood to assess how well your kidneys are working, since healthy kidneys remove creatinine efficiently.
Creatinine is a waste product produced by muscles during normal metabolism and filtered by the kidneys into urine. It is measured in blood to assess how well your kidneys are working, since healthy kidneys remove creatinine efficiently.
When elevated: Elevated blood creatinine suggests the kidneys may not be filtering waste effectively, which can indicate reduced kidney function or kidney disease. However, creatinine levels are also influenced by muscle mass, so context matters—a muscular person may have a higher baseline than someone with less muscle. When low: Low creatinine is generally not a clinical concern and does not indicate kidney disease. It may be seen in people with very low muscle mass, malnutrition, or certain chronic conditions, but it is not used diagnostically to detect disease.
24-hour urine creatinine reflects total daily muscle mass and metabolism, making it useful for tracking training volume effects and muscle breakdown patterns. Athletes with high training loads may show elevated excretion; this test can help assess whether recovery and nutrition are adequate to support muscle preservation during intense or prolonged training phases.
Turnaround Time
1 day (up to 3 days)
Method
Kinetic
Order online
Choose your lab and check out. We send your lab requisition automatically — no doctor visit needed.
Get your sample collected
Visit a lab service center near you for a quick blood draw (or book at-home phlebotomy where available).
See your results
Your results land in your Insider portal, ready to review and act on — that easy.
Your price
$20.00$60
3.0× less than retail
Versus the typical direct-to-consumer retail price for this test (illustrative — consumer prices vary by provider and region).
$20.00
Peer-reviewed sources supporting the educational content on this page.
Creatinine is a waste product produced by muscles during normal metabolism and filtered by the kidneys into urine. It is measured in blood to assess how well your kidneys are working, since healthy kidneys remove creatinine efficiently.
Creatinine is a waste product produced by muscles during normal metabolism and filtered by the kidneys into urine. It is measured in blood to assess how well your kidneys are working, since healthy kidneys remove creatinine efficiently.
When elevated: Elevated blood creatinine suggests the kidneys may not be filtering waste effectively, which can indicate reduced kidney function or kidney disease.
The Creatinine, 24-Hour Urine test starts at $20.00 at Labcorp. No doctor's visit and no insurance needed; we do not bill insurance. Fitomics Insider members pay from $15.00.
Results for the Creatinine, 24-Hour Urine test are typically ready about 1 day after your draw, and up to 3 days for some samples. Your results land in your Insider portal.
No. When you order the Creatinine, 24-Hour Urine test from Fitomics Research Labs, a licensed physician in our 50-state network reviews and signs your requisition after checkout, and it lands in your portal and inbox. Then visit any Labcorp, Quest, or BioReference patient service center for your draw; results post to your Insider portal.
Looking for something else? Browse every test by category.
