Hypocapnia
Overview
A reduced PaCO₂ of less than 36 mmHg on an arterial blood gas suggests the presence of a respiratory process - either primary (respiratory alkalosis) or secondary (respiratory compensation of metabolic acidosis).
Interpretation
- Elevated pH with reduced PCO₂ - suggests respiratory alkalosis
- Reduced pH with reduced PCO₂ and reduced HCO₃ - suggests respiratory compensation for metabolic acidosis
- Normal pH with reduced PCO₂ and reduced HCO₃ - suggests mixed respiratory alkalosis-metabolic acidosis
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