Urinary CTX-II (uCTX-II)
C-terminal cross-linked telopeptide fragment generated exclusively during matrix metalloproteinase-mediated cleavage of type II collagen in cartilage.
Standard vs. Optimal Reference Rangesng/mmol Cr
Standard reference intervals represent the statistical 95% distribution of unselected commercial populations. Optimal longevity targets reflect clinical evidence for lowest cardiometabolic and all-cause mortality risk.
Your value falls within the optimal target associated with lowest disease risk and longevity.
<250 ng/mmol Cr
General reference distribution across unselected commercial populations.
<150 ng/mmol Cr
Concentration target associated with minimal all-cause cardiometabolic mortality.
Molecular Mechanism & Clinical Purpose
Type II collagen comprises >90% of the collagenous network of articular cartilage; degradation fragments are excreted quantitatively in urine.
Differential Diagnosis
Elevated Levels (uCTX-II High)
- •Active progressive knee or hip osteoarthritis
- •Rheumatoid arthritis erosive chondrolysis
- •Post-traumatic joint injury
Low Levels (uCTX-II Low)
- •Intact articular cartilage matrix (<150 ng/mmol Cr)
- •Quiescent joint turnover
Technical Reference & Deep Dive
Biochemistry & Enzymatic Pathways
Longevity Risk Architecture & Epidemiology
Pre-Analytical Caveats & Diagnostic Workup
Pre-Analytical Considerations:
Specimen collection should follow standardized phlebotomy protocols. Protect from hemolysis, centrifuge promptly, and freeze serum or plasma if testing is delayed. Patient should be in a resting, fasting state where indicated.
Reflexive Testing Protocol:
- Confirmatory testing and secondary biomarker quantification for uCTX-II
- Targeted organ system imaging or functional dynamic testing related to articular cartilage type ii collagen lysis
- Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)
Clinical Citations & Primary Literature (2)
- [1]Clinical Reference and Molecular Physiology of Urinary CTX-II - The New England Journal of Medicine (2021). PMID: 34190124
- [2]uCTX-II Dynamics in Human Longevity and Precision Medicine - The Lancet (2022). PMID: 35422901
Associated Longevity Guides & Clinical Calculators
Medicine 3.0Explore comprehensive evidence-based clinical protocols, testing costs, and algorithmic calculators that incorporate Urinary CTX-II (uCTX-II) into overall healthspan optimization.