C-Telopeptide, Serum
C-Telopeptide (CTX) is a breakdown product of bone collagen that appears in blood when bone is being remodeled or lost. It's ordered to assess bone turnover rate, screen for osteoporosis risk, monitor bone health during menopause or aging, and evaluate treatment response in bone-related conditions.
High-intensity training and endurance exercise can increase bone turnover temporarily. CTX helps athletes and coaches identify excessive bone loss from overtraining, inadequate nutrition, or hormonal imbalance—particularly relevant for runners, female athletes with low energy availability, and older athletes concerned with fracture prevention. Persistently elevated CTX may signal that training load or recovery isn't supporting skeletal health.
Turnaround Time
3 days (up to 7 days)
Fasting Required
No
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
$105.00$315
3.0× less than retail
Versus the typical direct-to-consumer retail price for this test (illustrative — consumer prices vary by provider and region).
$105.00
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