A 20-year-old female completes a spirometry test with the following data: Measured Predicted LLN
FVC (L) 3.00 3.50 3.10
FEV₁ (L) 2.50 2.80 2.70
Based on the age of the patient and spirometry results,which of the following is possible if a fixed percent is used for the interpretation of the spirometry results?

Question

Quizplus · Accepted Answer

BUsing a fixed percentage for spirometry interpretation can lead to false-negative results because it might not accurately reflect the individual's lung function relative to their predicted values, especially if their actual values are close to the lower limit of normal (LLN) but not below it. Similarly, it can lead to false-positive results if the individual's results are slightly below the fixed percentage threshold but still above the LLN, suggesting an issue where there might not be one.

A 20-Year-Old Female Completes a Spirometry Test with the Following