uNormal bCO (maximum after holding breath 20 to 25 seconds)
Healthy
Relaxed Non-Smokers =
0-2 ppm
uMildly Elevated
bCO
Borderline Abnormal for Non-Smokers = 3-4 ppm
uModerately
Elevated bCO
Smokers and People with CO Disorders = 5-24 ppm
uHighly Elevated
bCO
Recently Smoked or CO Poisoned = 25-999+ppm
uAll healthy adults have approx. noon peak and midnight trough.
uHigher after supplemental oxygen & if standing vs. sitting vs.
supine.