Which test can be used to diagnose conditions such as asthma,pulmonary fibrosis (scarring of the lung tissue), and COPD (chronic obstructive pulmonary disease)?

Which test can be used to diagnose conditions such as asthma,pulmonary

1.	Which test can be used to diagnose conditions such as asthma,pulmonary fibrosis (scarring of the lung tissue), and COPD (chronic obstructive pulmonary disease)?
Answer» Which test can be used to diagnose conditions such as asthma,pulmonary fibrosis (scarring of the lung tissue), and COPD (chronic obstructive pulmonary disease)?