A 65-year-old male asked:
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what is the difference between pulmonary function test and methacholine challenge?

1 doctor answer
Dr. John Chiu
Dr. John Chiu answered
56 years experience Allergy and Immunology
Different: PFT measures your lung function in its current state. Methacholine challenge is often used when the lung function test is normal but asthma is suspected. If the methacholine test showed a reduction in FEV-1 by 20% at a certain concentration, then the patient is considered to have an overactive airway which is often but not always from asthma.
Answered on Oct 22, 2014

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