Table 3.
Medians, ranges, and upper and lower quartiles for the calculated acid–base variables
| Parameter | Minimum | 25% | Median | 75% | Maximum |
|---|---|---|---|---|---|
| AG (mmol/L) | 1.7 | 15.6 | 18.9 | 22.2 | 55.0 |
| AGcorrected (mmol/L) | 3.0 | 16.0 | 19.2 | 22.6 | 55.3 |
| Alb contribution (mmol/L) | 2.2 | 6.7 | 8.1 | 9.8 | 13.5 |
| Phosphate contribution (mmol/L) | 0.5 | 2.0 | 2.4 | 3.1 | 17.6 |
| Atot (mmol/L) | 4.0 | 9.3 | 11.0 | 12.7 | 23.5 |
| SIDapparent (mmol/L) | 6.4 | 32.2 | 35.8 | 39.5 | 65.6 |
| SIDeffective (mmol/L) | 10.6 | 32.4 | 36.0 | 39.6 | 65.6 |
| SIG (mmol/L) | −14.1 | 2.3 | 5.2 | 8.4 | 34.9 |
| SIGsimplified (mmol/L) | −8.2 | 0.9 | 4.2 | 8.1 | 39.8 |
| Water BE effect (mmol/L) | −8.7 | −1.1 | −0.2 | 0.6 | 8.7 |
| Cl− corrected (mmol/L) | 82.4 | 109.7 | 113.5 | 116.7 | 133.8 |
| Cl− effect (mmol/L) | −19.3 | −2.2 | 1.0 | 4.8 | 32.1 |
| Phosphate BE effect (mmol/L) | −15.2 | −0.8 | −0.1 | 0.4 | 1.9 |
| Albumin BE effect (mmol/L) | −4.3 | 0.6 | 2.8 | 4.6 | 10.6 |
| Lactate BE effect (mmol/L) | −17.0 | −3.3 | −2.1 | −1.3 | 0.0 |
| Sum of BE effects (mmol/L) | −20.7 | −2.7 | 0.4 | 3.8 | 40.3 |
| XA− (unmeasured acids) effect on BE (mmol/L) | −41.1 | −9.7 | −6.2 | −3.1 | 12.3 |
| XA− measured (with lactate) (mmol/L) | −10.5 | 5.9 | 8.8 | 11.9 | 38.1 |
| XA− measured (without lactate) (mmol/L) | −0.0 | 8.2 | 11.2 | 14.5 | 41.4 |
AG, anion gap; Atot, total plasma weak acids; BE, base excess; SID, strong ion difference; SIG, strong ion gap; XA−, unmeasured anions.