C-Telopeptide

Alternative Names/Synonyms	Beta-Crosslaps, C-Terminal Telopeptide, CTX
Laboratory	Core Laboratory & Transfusion Medicine
Sub-section	Biochemistry
Specimen Type	Blood
Test Code	BCTXE

Clinical Significance (If applicable)

Monitoring the efficacy of antiresorptive therapy in osteoporosis or other bone diseases.

Specimen Requirements (Sample Type)

Plasma

Specimen Requirements (Volume (mL))

0.5 mL

Specimen Requirements (Tube Type)

Plasma (Lavender Tube only)
Collection Containers – Tube Types

Collection Requirements

Collection Instructions

Sample Stability

Room Temperature: 24 hours

Fridge: 8 days @ 2-8°C

Freezer: 3 months @ -20°C

Cause for Rejection

Specimen Acceptability and Transport Guidance

Instrument, Methodology

Roche cobas e 602, immunoassay

Test Availability

24 hours a day, 7 days a week

STAT Turnaround Time

1 hour

Routine Turnaround Time

3 hours

Reference Ranges

Females:
< 30 years: 148 - 967 ng/L
30 to ≤ 40 years: 150 - 630 ng/
40 to ≤ 50 years: 131 - 670 ng/L
50 to ≤ 60 years: 183 - 1060 ng/L
60 to ≤ 70 years: 171 - 970 ng/L
> 70 years: 152 - 858 ng/L

Males:
< 30 years: 238 - 1019 ng/L
30 to ≤ 40 years: 225 - 936 ng/L
40 to ≤ 50 years: 182 - 801 ng/L
50 to ≤ 60 years: 161 - 737 ng/L
60 to ≤ 70 years: 131 - 752 ng/L
> 70 years: 118 - 776 ng/L

In case of discrepancies, always interpret results using reference ranges as stated on laboratory reports and/or electronic patient chart.

Laboratory Contact Information

416-586-4800 extension 4688

Patient Preparation

Fasting, morning sample is preferred.