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Test Code CTX C-Telopeptides (CTx), serum

Additional Codes

Epic Ordering Code LAB5061
NBS code LBC06480
Service code 31034

Specimen Requirements

Submit only one of the following:

Preferred: Acceptable:
Yellow Top Red Top

Processing Requirements

Allow specimen to clot for 30 mins and centrifuge within 2 hours

Specimen type: Serum

Volume: 0.5mL

Specimen Stability

Specimen Type Serum
Ambient 6 hours
Refrigerate 8 hours
Frozen 3 months

Specimen Condition

Haemolysis OK
Icterus OK
Lipaemia OK
Others Not applicable

Methodology

Electrochemiluminescent Immunoassay

Days and Times Performed

Monday through Friday, TAT 1-4 days

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.

Update

Last updated 16/07/2026

LOINC Code Information

41171-0

Alias

B-CTx

Beta CrossLaps (Beta-CTx)

C-terminal collagen crosslinks

Carboxy terminal collagen crosslinks