Carbon monoxide levels in the body / blood stream. What is normal? What is dangerous?
Low carbon monoxide levels in the blood stream (COHb) and cellular tissues are normal and necessary for proper cellular functioning.
However there is not uniform agreement as to what "normal" levels in the blood stream are within
Any carbon monoxide levels above "normal" is considered dangerous.
- Health effects can start to become noticeable in people once carbon monoxide levels (COHb) reach 2.5% in the bloodstream.
- Non-smokers living away from urban areas have "normal" carbon monoxide levels in the blood stream of 0.4%
- Carbon monoxide levels of 1% to 5% may be considered "normal" if a person lives in a busy urban or
- Carbon monoxide in cigarettes causes a smoker to typically
have levels of 5% or more.
- Otherwise "healthy" heavy smokers seem to be able to tolerate carbon monoxide levels in the blood stream
(carboxyhemoglobin) of up 10%+ without obvious damage; however, this puts them at greater risk of damage and symptoms and after effects of carbon monoxide
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