Which of the following will not cause a low lung diffusing capacity(DL)?: (A) Decreased diffusion distance, (B) Decreased capillary blood volume, (C) Decreased surface area, (D) Decreased cardiac output
Answer is A. A decrease in the diffusion distance will lead to an increase in DL. A decrease in capillary blood volume, surface area, cardiac output, and blood hemoglobin concentration will decrease DL.