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Labcorp Oklahoma, Inc.
Test Directory


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Collagen Type I C-Telopeptide(CTx)

Order Name C TELOPEP
Test Number: 5572555
Revision Date 12/12/2022
Test Name Methodology LOINC Code
Collagen Type I C-Telopeptide(CTx)
Electrochemiluminescent Immunoassay 41171-0 
SPECIMEN REQUIREMENTS
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 1 mL (0.5) Serum Clot Activator (Red Top, No-Gel) Frozen
Instructions Notes: 0.3 mL (Note: This volume Does NOT allow for repeat testing).
Specimen Type: Gel-barrier tube
Specimen Storage: FREEZE
Specimen Collection: It is recommended to draw blood as fasting, morning samples. Samples should not be taken from patients receiving therapy with high biotin doses (i.e. > 5 mg/day) until at least 8 hours following the last biotin administration. Separate serum from cells within 45 minutes of collection and Freeze. Transfer specimen to a plastic transport tube before freezing. To avoid delays in turnaround time when requesting multiple test on frozen samples, PLEASE SUBMIT SEPARATE FROZEN SPECIMENS FOR EACH TEST REQUESTED.
Special Instructions: Testing is performed at Esoterix Endocrinology Laboratory: ES#500130 This test may exhibit interference when sample is collected from a person who is consuming a supplement with a high dose of biotin (also termed as vitamin B7 or B8, vitamin H, or coenzym
Specimen Stability: Ambient: 1 day, Refrigerated : 14 days, Frozen: 2 years
GENERAL INFORMATION
Expected TAT 3 - 5 days  
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. 
Performing Labcorp Test Code 500089 
CPT Code(s) 82523
Lab Section Reference Lab