03-21-2007, 08:13 PM
The clinical test diffusing capacity of the lung (DL) most commonly uses carbon monoxide (CO) as the tracer gas for measurement because of its high affinity for binding to the hemoglobin molecule. This property allows a better measurement of pure diffusion, such that the movement of the CO is in essence only dependent on the properties of the diffusion barrier and the amount of hemoglobin.
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