基本可以確定有COPD，但不確定是否這次肺部疾病是由COPD引起。

https://www.healthline.com/health/copd/tests-diagnosis

According to the COPD GOLD guidelines from 2016:

GOLD Stage of COPD	Percentage of predicted FEV1 value
mild	80%
moderate	50%–79%
severe	30%–49%
very severe	Less than 30%