Question

During a routine screening for a patient participating in a smoking cessation program, a male patient who reports he has reduced his smoking habits by 50% has a COHb level of 6.7. This finding is

A. a low level for a smoker, explained by the recently reported reduction in smoking
B. a venous carboxyhemoglobin sample reading
C. an inaccurate result that should be repeated after a two point calibration of the instrument
D. normal level for a smoker

Answer 1

The COHb level of 6.7 is within the expected range for a smoker, especially one who has recently decreased their smoking habits. While it is higher than that of a non-smoker, it may accurately reflect the patient's current status.

Step-by-step explanation:

The patient's COHb level of 6.7 can be considered a normal level for a smoker, especially if he has recently reduced his smoking habits. While the normal level for non-smokers in cities could be up to around 1%, it can go higher in smokers or in areas with high pollution. A level of 6.7 indicates that he has a higher level than a non-smoker, but it could reflect his recent reduction in smoking. It is important also to note the precision and calibration of the measuring device, and if there is any doubt about the accuracy of this result, a two-point calibration should indeed be performed to ensure the correct functioning of the instrument. The COHb level should not be confused with hemoglobin A1c, which is a measure typically associated with monitoring diabetes control over a period of time.