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Performance specifications of the two automated assays for serum C-terminal telopeptide of type I collagen (CTX) [references 27–29].
| β-CTX assay | Measuring range | Lower limit of detection | Intra-assay CV | Inter-assay CV |
|---|---|---|---|---|
| iSYS, IDS, UK | 50-6000 ng/L | 20 ng/L | 2.7-3.7% | 2.5-5.2% |
| Roche Diagnostics, Germany | 10-6000 ng/L | 10 ng/L | 1.2-4.1% | <5.7% |
| CrossLaps®, IDS, UK | 20-3380 ng/mL | 20 ng/L | <2.5% | 2.2-5.5% |
