Arterial Blood Gas
Arterial blood gas (ABG) analysis in CO poisoning often reveals a normal acid-base status and partial pressure of oxygen, arterial (PaO2). The oxygen saturation reading on blood gas analysis may be spuriously normal, depending on the type of analyzer used by the laboratory. In cases of severe CO poisoning, the ABG might reveal a metabolic lactic acidosis.96 In fire victims, an ABG with severe metabolic lactic acidosis (ie, pH < 7.20) should prompt consideration of cyanide poisoning and empiric treatment.40
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