A patient whose FVC is 4 L performs two DLCOsb maneuvers with the following results: The pulmonary function technologist should: A) Reject Trial 1 because of the V_I. B) Reject Trial 2 because of the breath-hold time. C) Report the DLCOsb as 22.0 ml CO/min/mm Hg. D) Report the DLCOsb as 21.2 ml CO/min/mm Hg.

Question

Quizplus · Accepted Answer

Both trials meet acceptability criteria (FVC and breath-hold time) but the DLCOsb value for Trial 1 (18.8 ml CO/min/mm Hg) is more than 10% lower than Trial 2 (21.2 ml CO/min/mm Hg), so it should be considered an outlier and not be used in the final calculation of DLCOsb. Therefore, the DLCOsb should be reported as 21.2 ml CO/min/mm Hg, which is the result of the acceptable Trial 2.

A Patient Whose FVC Is 4 L Performs Two DLCOsb