Test Overview
Test Methodology

Electrochemiluminescence Immunoassay

Test Usage

An aid in monitoring antiresorptive therapies (eg, bisphosphonates and hormone replacement therapy) in postmenopausal women treated for osteoporosis and individuals diagnosed with osteopenia. An adjunct in the diagnosis of medical conditions associated with increased bone turnover

Reference Range *

MALES: <5 yrs 242-1292 pg/mL; 5-9 yrs: 351-1532 pg/mL; 10-15 yrs: 447-2457 pg/mL; 16-17 yrs: 478-1666 pg/mL; 18-30 yrs: 120 - 946 pg/mL; 31-50 yrs: 93 - 630 pg/mL; 51-70 yrs: 35 - 836 pg/mL; >70 yrs: not established. FEMALES: <5 yrs:347-1508 pg/mL; 5-9 yrs: 383-1556 pg/mL; 10-15 yrs: 311-1776 pg/mL; 16-17 yrs: 146-1266 pg/mL; Premenopausal: 25 - 573 pg/mL; Postmenopausal: 104 - 1008 pg/mL.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details
Days Set Up
Monday - Saturday
Analytic Time

2 - 4 days

Soft Order Code
CTX
Synonyms
  • C-terminal collagen crosslinks
  • B-CTx
  • C-Telopeptides, Serum
  • C-Telopeptide, Beta Cross-Linked, Serum
Laboratory
Sendout
Reference Laboratory
Mayo CTX (83175)
Section
Special Testing
Test Updated
06/30/2020
Update Type
Reference range changed
Specimen Requirements
Collection Instructions

Collect specimen in an SST or red top tube from a fasting patient. Centrifuge, aliquot serum into a plastic vial and freeze (preferred) or refrigerate up to 3 days.

Special Handling

Fasting specimen.

Yellow Top Tube
Normal Volume
1 mL serum
Minimum Volume
0.8 mL serum
Additional Information

Test sent to Mayo Medical Laboratories.

Billing
CPT Code
82523
Fee Code
AA133
LOINC
41171-0
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