Arterial blood gas analysis
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Basics
pH
- Measurement of acidity or alkalinity of solution . The normal range is 7.35 to 7.45
- pH > 7.45 = alkalosis
- pH< 7.35 = acidosis PO2
PaO2 The partial pressure of oxygen that is dissolved in arterial blood. The normal range is 80 to 100 mm Hg. SaO2 The arterial oxygen saturation. The normal range is 95% to 100%. pCO2
- The amount of carbon dioxide dissolved in arterial blood. The normal range is 35 to 45 mm Hg.
- pCO2 >45 = acidosis
- pCO2 <35 = alkalosis HCO3
The calculated value of the amount of bicarbonate in the bloodstream. The normal range is 22 to 26 mEq/liter
HCO3 The calculated value of the amount of bicarbonate in the bloodstream. The normal range is 22 to 26 mEq/liter HCO3 > 26 = alkalosis HCO3 < 22 = acidosis B.E. The base excess indicates the amount of excess or insufficient level of bicarbonate in the system. The normal range is -2 to +2 mEq/liter. Remember: A negative base excess indicates a base deficit in the blood.