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Performance specifications of the two automated assays for serum C-terminal telopeptide of type I collagen (CTX) [references 24,27,28].
| 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% |
