What diagnosis is indicated by the results of a pulmonary function test showing FEV1 = 4.2L, FVC = 5.1L, and FEV1/FVC = 0.82?

The results of the pulmonary function test indicate a normal pulmonary function status. Specifically, the FEV1 (Forced Expiratory Volume in 1 second) is 4.2L, and the FVC (Forced Vital Capacity) is 5.1L, which are both within normal range for a healthy individual. The key metric here is the FEV1/FVC ratio, which is calculated to be 0.82.

In pulmonary function testing, an FEV1/FVC ratio of 0.70 or higher typically indicates the absence of obstructive lung disease. In other words, this ratio signifies that the lung volumes are well maintained during a forced expiration, which correlates with normal respiratory function. Because the FEV1 and FVC values are both normal and the ratio suggests proper airflow, these results confirm that the individual does not exhibit signs of obstructive or restrictive lung disease.

Therefore, the interpretation of the pulmonary function test shows normal pulmonary function, making the conclusion that the diagnosis indicated by these results would be a normal PFT result.