Criteria for Occupational Asthma

Criteria for the Diagnosis of Occupational Asthma

(1) new onset or reactivation of quiescent reversible bronchospasm

AND

(2) at least 2 of the following:

(2a) Cross shift losses of >= 10% FEV1 by spirometry.

(2b) A clear history of temporal periodicity of symptoms in association with work exposures.

(2c) A documented exposure to an agent previously proven to cause asthma.

(2d) Remission of symptoms after withdrawal from exposure.