can CO be found in your blood stream 4-5 months after exposer? I had a patient loose consciousness on a bus and they found co in her blood. The bus was tested and no CO found. She was exposed to CO in her home 4-5 months prior due to faulty heating system.
HI First I assume you mean Carbon Monoxide by CO. See CO either dissolves in blood or it combines with hemoglobin. If it dissolves it won't stay for more than 3-5 days but if it combines with hemoglobin it can stay for 60-90 days.  But more than 90 days it cannot be detected. I think there might have been some other problem for her loss of consciousness. Any clarifications feel free to ask.