Table 1 IQC details of CD4 testing laboratories
Laboratories | Instrument used | Mean (range of % variation for duplicate analysis) | Mean (range % CV for commercially available controls) |
|---|---|---|---|
Laboratory 1 | FACSCount | 2.43, 0.6–3.3 | 3.9, 2.7–4.9 (IMMUNO-TROL) |
Laboratory 2 | FACSCount | 7.2, 5.5–12.0 | 5.4, 3.4–7.0 (multi-check) |
Laboratory 3 | FACSCalibur | 5.7, 2.5–7.2 | 12.4, 12.0–12.8 (multi-check) |
Laboratory 4 | FACSCalibur | 5.1, 4.2–5.8 | – |
Laboratory 5 | FACSCalibur | 4.4, 2.6–6.4 | 2.2, 1.6–2.6 (multi-check) |
Laboratory 6 | FACSCalibur | 5.9, 4.2–7.0 | 3.4, 3.0–3.8 (multi-check) |
Laboratory 7 | FACSCount | 2.6, 2.1–3.5 | 3.5 (multi-check) |
Laboratory 8 | Cyflow | 2.9, 2.0–3.9 | – |
Laboratory 9 | Cyflow | 0.5, 0.3–1.2 | – |
Laboratory 10 | Cyflow | 3.5, 1.6–5.6 | – |
Laboratory 11 | FACSCalibur | 4.8, 3.5–5.3 | – |