| Blood Gas Feature | Normal Value | Respiratory Acidosis | Value with: | Metabolic Alkalosis | |
|---|---|---|---|---|---|
| Respiratory Alkalosis | Metabolic Acidosis | ||||
| HCO3 (bicarbonate) | 22–26 mm Hg | Normal or ↑ | Normal or ↓ | ↓ | ↑ |
| PCO2 | 35–45 mm Hg | ↑ | ↓ | Normal or ↓ | Normal or ↑ |
| (Carbonic acid*) | (1.05–1.35) | ↑ | ↓ | Normal or ↓ | Normal or ↑ |
| pH (hydrogen ion concentration) | 7.35–7.45 | ↓ | ↑ | ↓ | ↑ |
↑ = increased; ↓ = decreased.
* To obtain carbonic acid level, multiply PCO2 value by 0.03.