Collagen Type I C-Telopeptide
Label Mnemonic: CTX
Epic Lab Code: LAB4868
Downtime Form: A-1a Doctor/Provider Orders - Pathology Core and Specialty Care Nursery
Commercial Mail-out Laboratory
5231 RCP
Specimen Instructions:
In patients receiving therapy with high biotin doses (i.e. Greater than 5 mg/day), no specimen should be taken until at least 8 hours after the last biotin administration.
Collection Medium:
Pink top tube 6 mL (K2-EDTA)
Preferred Minimum: 1 mL plasma
Absolute Minimum: 0.5 mL plasma
Rejection Criteria:
Hemolyzed specimens.
Testing Schedule:
1-4 days upon receipt at reference laboratory.
Reference Range:
Age Female Male 6 months-6 years 500-1800 pg/mL 500-1700 pg/mL 7-9 years 566-1690 pg/mL 522-1682 pg/mL 10-12 years 503-2077 pg/mL 553-2071 pg/mL 13-15 years 160-1590 pg/mL 485-2468 pg/mL 16-17 years 167-933 pg/mL 276-1546 pg/mL 18-29 years 64-640 pg/mL 87-1200 pg/mL 30-39 years 60-650 pg/mL 70-780 pg/mL 40-49 years 40-465 pg/mL 60-700 pg/mL 50-69 years 40-840 pg/mL 70 years or greater 52-847 pg/mL Postmenopausal 104-1008 pg/mL
CTx is useful to assess bone resorption in patients with metabolic bone disease. The test is also useful in monitoring therapy to slow or halt osteoporotic bone loss.
Quantitative Electrochemiluminescent Immunoassay
CPT Code: