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HelpTest Code CTX C-Telopeptides (CTx), serum
Laboratory Code
LAB5061
Specimen Requirements
Specimen Type: Serum
Container/Tube: Red Top (Plain)
Volume: 6.0 mL
Minimum Volume: 0.5 mL serum
Collection Instructions: Fast patient 10 - 12 hours before sample collection. Allow specimen to clot for 30 mins and centrifuge within 2 hrs.
Specimen Stability
| Specimen Type | Serum |
|---|---|
| Ambient | 6 hours |
| Refrigerate | 8 hours |
| Frozen | 3 months |
Methodology
Electrochemiluminescent Immunoassay
Days and Times Performed
Monday through Friday, TAT 4 days
Specimen Condition
| Gross Haemolysis | Alert/Reject |
|---|---|
| Icterus | OK |
| Lipaemia | OK |
| Others | Not applicable |
Reference Interval
| Age | Male | Female |
|---|---|---|
| 0 – 29 yrs | 0.238 – 1.019 ug/L | 0.148 – 0.967 ug/L |
| 30 – 39 yrs | 0.225 – 0.936 ug/L | 0.150 – 0.635 ug/L |
| 40 – 49 yrs | 0.182 – 0.801 ug/L | 0.131 – 0.670 ug/L |
| 50 – 59 yrs | 0.161 – 0.737 ug/L | 0.183 – 1.060 ug/L |
| 60 – 69 yrs | 0.132 – 0.752 ug/L | 0.171 – 0.970 ug/L |
| ≥ 70 yrs | 0.118 – 0.776 ug/L | 0.152 – 0.858 ug/L |
| Pre – menopausal | – | 0.136 – 0.689 ug/L |
| Post – menopausal | – | 0.177 – 1.015 ug/L |
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
A marker for bone resorption.
Monitoring antiresorptive therapies (e.g. bisphosphonates and hormone replacement therapy) in postmenopausal women treated for osteoporosis.
Service Code
31034
LOINC Code Information
41171-0
Alias
B-CTx
Beta CrossLaps (Beta-CTx)
C-terminal collagen crosslinks
Carboxy terminal collagen crosslinks
Update
Last updated 10/03/2025