Aerial blood gas analysis in Carbon monoxide poisoning shows:
B i.e. PO2 normal O2, saturation less with normal or slightly decreases PCO2.
PO2 less, O2 saturation normal
PO2 normal, O2 saturation less with normal or slightly decreased PCO2
PO2 less, O2 saturation normal
PO2 less, O2 saturation decreased