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A 27-year-old male asked:

What does diffusion is mildly impaired byt when corrected to alveolar volume it is normal mean on a pft?

4 doctor answers5 doctors weighed in
Dr. Michael Dugan
Specializes in Hematology
Not much: It means that the gas exchange is on the low side, but when the calculation is adjusted for lung size it is normal.
Dr. Mario Mangas
Internal Medicine 38 years experience
DLCO VS DLCOVA: This is a way of determining if a diffusion impairment is a disease vs a defect. Example; pulmonary fibrosis(disease) or someone who had removed a lung therefor you have a reduced capacity(defect). It's to correct for the reduction in lung volume. Hope this helps clarify the question.
Dr. Scott Selinger
undefined 12 years experience
Size does matter: This means that the passage of oxygen and carbon dioxide from the lungs to the blood is slightly lower than what it would be for an average person, but since we are all different sizes and our lungs are also different sizes, "average" usually doesn't apply to most people, especially people who are taller/shorter. This finding means that the lungs are normal when adjusted for that size difference.
Dr. Scott Selinger
undefined 12 years experience
Size does matter: This means that the passage of oxygen and carbon dioxide from the lungs to the blood is slightly lower than what it would be for an average person, but since we are all different sizes and our lungs are also different sizes, "average" usually doesn't apply to most people, especially people who are taller/shorter. This finding means that the lungs are normal when adjusted for that size difference.

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Last updated Sep 28, 2016

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