Collagen Type I C-Telopeptide
Label Mnemonic: CTX
Epic Lab Code: LAB4868
Downtime Form: A-1a Miscellaneous Request
Commercial Mail-out Laboratory
5231 RCP
356-8593
Specimen(s):
Plasma
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)
Minimum:
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
Comments:
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.
Methodology:
Quantitative Electrochemiluminescent Immunoassay
CPT Code:
82523