What is the likely FEV1/FVC ratio in a patient classified as GOLD stage 3 COPD?

In the context of COPD (Chronic Obstructive Pulmonary Disease) classification according to the Global Initiative for Chronic Obstructive Lung Disease (GOLD), Stage 3 is characterized by a significant decrease in lung function. The FEV1/FVC ratio is a vital measurement used to assess the degree of airflow limitation in patients.

For GOLD Stage 3 COPD, the FEV1 (Forced Expiratory Volume in one second) is less than 50% of the predicted value but greater than or equal to 30%. Consequently, the FEV1/FVC ratio typically falls within the range of 50% to 65%. This reflects a more pronounced obstruction compared to earlier stages but not as severe as in Stage 4, where the FEV1 is less than 30% of the predicted value.

The ranges given in the options align as follows:

• When the FEV1 is above 50%, a ratio between 50% and 65% is expected, which is consistent with a Stage 3 classification of COPD.

• Values below 50% indicate more severe obstruction, fitting the criteria for GOLD Stage 4.

• Ratios above 70% or 80% would suggest a normal or mild restriction pattern