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CTx

Source Blood
Mnemonic CTX
Specimen Requirements

1 x 3 mL light green (mint) top PST tube.  Gold top SST tube, lavender top EDTA tube and green top sodium heparin tube also acceptable.

0.5 mL plasma or serum
Pediatric: 1.0 mL whole blood

Patients are recommended to fast for 10 hours, however a fasting interval of 9-14 hours is acceptable.

Specimen Handling PSC and RRL: 
Centrifuge, pour off and mark aliquot tube with collection tube type (e.g. "PST"), then transport plasma or serum to DSC.

Extra-regional: 
Centrifuge, pour off and mark aliquot tube with collection tube type (e.g. "PST"), then freeze plasma or serum before transporting to DSC.

DSC: 
Freeze specimens upon receipt in lab; ensure frozen specimens do not thaw.
Additional Information This assay detects: C-Terminal Telopeptides of Type I collagen, cross linked and isomerized.
ß-Cross Laps/serum assay, Roche Diagnostics Ltd.
Testing Location Immunochemistry
Testing Frequency Monday, Wednesday & Friday
Alternate Name(s) C-Telopeptide (serum), C-Terminal Telopeptides, Beta Cross Laps, Collagen Type I C-Telopeptide
Reference Interval Male:       0 - 400 ng/L
Female:   0 - 400 ng/L