POCT Method Comparison and Correlation Protocol

22 pages. Explains how to establish whether a point of care device agrees sufficiently with the central laboratory, starting from the step usually skipped: defining the acceptable difference on clinical grounds before any data are collected. Covers three routes to setting that limit, specimen numbers and range coverage, four analysis figures, six patterns of disagreement and what each implies, acceptance criteria, a twelve step failure investigation, device to device comparison, qualitative test agreement and ten frequency triggers. Includes a full twenty pair worksheet