ARUP's Laboratory Test Directory

C-Telopeptide, Beta-Cross-Linked, Serum : 0070416
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Additional Technical Information
  


Mnemonic: CTX

Methodology: Quantitative Electrochemiluminescent Immunoassay
Performed: Tue, Thu, Sat
Reported: 1-4 days
Specimen Required: Patient Prep: For patients receiving therapy with high biotin doses (e.g. greater than 5 mg/day), specimen should not be drawn until at least 8 hours after the last biotin administration.

Collect: Serum separator tube, pink (K2EDTA), or green (sodium heparin).

Specimen Preparation: Allow serum separator tube to sit for 15-20 minutes at room temperature for proper clot formation. Centrifuge and separate serum or plasma from cells ASAP or within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.5 mL)

Storage/Transport Temperature: Frozen.

Unacceptable Conditions: Hemolyzed specimens.

Stability (collection to initiation of testing): After separation from cells: Ambient: 8 hours; Refrigerated: 8 hours; Frozen: 3 months
Reference Interval:
Effective November 14, 2011
 
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  
CPT Code(s): 82523
Cross References: Beta-Cross Laps (C-Telopeptide, Beta-Cross-Linked, Serum), Collagen C Telopeptide (C-Telopeptide, Beta-Cross-Linked, Serum), Collagen Type I-C Telopeptide (C-Telopeptide, Beta-Cross-Linked, Serum), CTx (C-Telopeptide, Beta-Cross-Linked, Serum)