Table 2. Between-day imprecision of central laboratory automated analyzers (Lab).
| Level 1 | Level 2 | Level 3 | Average CV (%) | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| QC | Mean | CV (%) | QC | Mean | CV (%) | QC | Mean | CV (%) | ||
| Na+, mmol/L | 122 | 122.8 | 0.7 | ND | ND | ND | 153 | 153.4 | 0.7 | 0.7 |
| K+, mmol/L | 3.93 | 3.96 | 0.7 | ND | ND | ND | 6.64 | 6.59 | 1.1 | 0.85 |
| Cl-, mmol/L | 89.9 | 90 | 0.65 | ND | ND | ND | 111 | 110.8 | 0.75 | 0.7 |
| HCO3-, mmol/L | 10 | 10.7 | 3.5 | 16 | 17.4 | 3.9 | 27 | 30 | 2.2 | 3.2 |
| Glu, mg/dL | 103 | 101 | 1.65 | ND | ND | ND | 240 | 240 | 1.35 | 1.5 |
| Hb, g/dL | 4.6 | 4.7 | 1.13 | 12 | 11.9 | 1.02 | 15.6 | 15.5 | 1.01 | 1.05 |
| Hct, % | 14.4 | 14.8 | 0.9 | 36.1 | 36 | 0.86 | 47.6 | 47.8 | 0.9 | 0.89 |
ND is Not Done, QC is quality control (target), CV is Coefficient of Variation, Na+ is sodium, K+ is potassium, Cl- is chloride, HCO3- is bicarbonate, Glu is glucose, Hb is hemoglobin, and Hct is hematocrit.