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Labcorp Oklahoma, Inc.
Test Directory


Collagen Type I C-Telopeptide(CTx)

Order Name C TELOPEP
Test Number: 5572555
Revision Date 09/06/2022
Test Name Methodology LOINC Code
Collagen Type I C-Telopeptide(CTx)
Electrochemiluminescent Immunoassay 41171-0 
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 1 mL (0.5) Serum Clot Activator (Red Top, No-Gel) Frozen
Alternate 1 1 mL (0.5) Plasma EDTA (Lavender Top) Frozen
Instructions Patient Prep: Morning fasting specimen preferred.
Serum from SST, or plasma from Lavender EDTA, or Green (lithium heparin).
Allow serum separator tube to sit for 15-20 minutes at Room Temperature
Centrifuge and separate serum or plasma from cells ASAP or within 2 hours of collection Transfer 1 mL (Min: 0.5 mL) serum or plasma to a Standard Transport Tube and freeze.
CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered
Unacceptable Conditions: Hemolyzed specimens; Green LiHep or NaHep tubes.
Stability: After separation from cells: Ambient: 24 hours; Refrigerated: 48 hours; Frozen: 3 months
Testing Schedule Sun-Sat 
Expected TAT Within 24 hours of specimen receipt in lab  
Clinical Use CTx is useful to asses bone resorption in patients with metabolic bone disease. The test is also useful in monitoring therapy to slow or halt osteoporotic bone loss. 
Notes Reference Lab: ARUP
Test Code: 70416
Click Here to view information on the ARUP website.
CPT Code(s) 82523
Lab Section Reference Lab