The editorial, “When Should Specific Occupational Challenge Tests Be Performed?” published in the May 2013 issue of CHEST (2013;143[5]:1196-1198) contained an error in the text. The last paragraph in the right-hand column on page 1197 included the wrong concentration. It should have read 5 parts per billion rather than 5 parts per million.
The corrected text reads: Particularly concerning in this series was that one subject had a life-threatening response after exposure to only 30 s of methylene diphenyl diisocyanate at a low concentration of 5 parts per billion.
The article has been corrected.