Before interpreting pulmonary function test results, which of the following must be verified?

To interpret pulmonary function test results accurately, it is crucial to verify that the test is both acceptable and reproducible. Acceptability refers to whether the test meets the quality standards for performance, which includes proper technique, effort from the patient, and minimal artifacts in the results. Reproducibility ensures that when the test is repeated under similar conditions, consistent results are obtained. This reliability is essential for making meaningful clinical assessments and comparisons over time or between different patients.

If the test is not acceptable or reproducible, any conclusions drawn from the results may be misleading. Therefore, confirming these aspects enables clinicians to trust the data when diagnosing or managing respiratory conditions.