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Inter-laboratory variation (expressed as CV%) with and without calibration using a DBS standard in 79 laboratories
| Parameter | Sample 1 | Sample 2 | Sample 3 | Sample 4 | Mean |
|---|---|---|---|---|---|
| Phenylalanine concentration (μmol/L) | 120 | 330 | 420 | 940 | 452 |
| Inter-laboratory CV without calibration | 23% | 20% | 18% | 20% | 20% |
| Inter-laboratory CV with calibration | 14% | 9% | 8% | 9% | 10% |
Abbreviation: CV, coefficient of variation; DBS, dried blood spot.
