Measures:
- **pO<sub>2</sub>**: oxygen in the blood (if ↓, use the [[A-a gradient]] to figure out why)
- **pCO<sub>2</sub>**: carbon dioxide in the blood
- **HCO<sub>3</sub>**: bicarbonate in the blood (some labs report tCO<sub>2</sub>, which is very similar and the two can be used interchangeably)
- **pH**: blood pH
The sample is taken from an artery, not a vein.
![[ABG interpretation.png]]