Criteria: Table 5-5 Criteria for Rating Permanent Impairment Due to Asthma (90)
Key factor is PC20 – objective tests for degree of airway hyperresponsiveness. Non-key adjustment factors are clinical parameters (such as minimum medication needed and frequency of attacks) and maximum postbronchodilator FEV1 percentage predicted. Maximum impairment for Class 4 is 65% WPI. Note revisions provided in “Corrections and Clarifications” (AMA Press, August 2008) on page 10 to Clinical Parameters in Class 2.
