Which of the following pulmonary function tests are most useful in determining whether a pa-tient with restrictive lung disease should be considered for pulmonary rehabilitation?

1. DLCO
2. Total lung capacity (TLC)
3. FEV1/FVC
a. 1 and 2 only
b. 2 and 3 only
c. 1 and 3 only
d. 1, 2, and 3

ANS: A
DLCO and TLC are the most useful pulmonary function tests to evaluate the need of pulmonary rehabilitation of patients with restrictive lung disease. Patients in whom there is a significant re-strictive lung disease with a TLC of less than 80% of predicted and single-breath carbon monox-ide–diffusing capacity (DLCO) of less than 80% of predicted.