A total of 429 (64%) physicians returned surveys, 22 of whom did not meet criteria for inclusion in the analysis. Most respondents had both heard of (91%) and read (72%) the National Asthma Education and Prevention Program (NAEPP) guidelines. For diagnosis, 75% reported routine use of office peak flow measurement, but only 21% used spirometry routinely. Family physicians were more likely than pediatricians to use spirometry in diagnosis (odds ratio [OR] = 5