To monitor compliance in a smoking cessation program for pulmonary rehabilitation, which value should be evaluated?

In monitoring compliance in a smoking cessation program for pulmonary rehabilitation, the most effective value to evaluate is multiple wave-length spectrophotometry. This technique allows for the assessment of carboxyhemoglobin levels, which can indicate exposure to carbon monoxide from smoking. Through this evaluation, healthcare providers can objectively confirm whether participants have ceased smoking by analyzing the concentrations of various hemoglobin types in the blood.

The other options, while related to respiratory function and gas exchange, do not directly measure compliance with smoking cessation. For instance, methemoglobin levels (metHb) can indicate certain types of hemoglobinopathies or could be elevated due to certain medications or exposures but do not specifically reflect smoking status. PaO2 and SpO2 indicate oxygen levels and saturation in the blood but do not provide information regarding smoking behavior. Therefore, multiple wave-length spectrophotometry is the best choice for monitoring compliance in a smoking cessation program.