McKenna is a certified medical review officer. In that capacity, he is certified to read and review drug tests to see if they are truly positive to drugs, and that the test is not a false positive, he said. Machines can test a patient's lungs and how well they are breathing, he said. It is important for workers who will use respirators at their jobs, he added. The office also does respiratory fit testing.
Workers can bring in their personal respirator outfits they use on the job for testing.
Chemicals are sprayed to see if the patient can smell the odors and determine if the respirator fits correctly. Functional capacity exam for chronic cases also determines what a person can or cannot do. McKenna lives in Oklahoma City with his wife, he said, and makes the daily commute to Shawnee. McKenna is certified by the American Board of Emergency Medicine. He was originally certified in 1990, and was recertified in 1998.