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Mycobacterial testing in clinical laboratories that participate in the College of American Pathologists Mycobacteriology Surveys. Changes in practices based on responses to 1992, 1993, and 1995 questionnaires.

Woods, G L Long, T A Witebsky, F G
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    OBJECTIVE--To determine whether the trend of increasing use of rapid methods of mycobacterial testing among participants in the College of American Pathologists (CAP) Mycobacteriology E Proficiency Testing Survey noted between 1992 and 1993 continued through 1995, and to collect information concerning mycobacterial staining and culture protocols from laboratories that do limited mycobacterial testing. METHODS--The 1993 CAP E Survey questionnaire addressing mycobacterial laboratory practices, test volumes, and rate of recovery of drug-resistant Mycobacterium tuberculosis was included with the CAP 1995 E-A Survey. A shortened list of these same questions, excluding those addressing mycobacterial identification and susceptibility test methods, was added to the CAP 1995 E1-A Survey, to which laboratories that do limited mycobacterial testing subscribe. RESULTS--A total of 802 and 1490 participants in the E and E1 surveys, respectively, returned responses to the CAP by the cutoff date for data analysis. For E Survey participants who answered questions concerning test methods in the years being compared, the percentage who used rapid techniques increased significantly over the study period. More participants used the fluorochrome stain (58% in 1992, 62% in 1993, and 72% in 1995), BACTEC TB plus a solid medium for culture (36% in 1992, 42% in 1993, and 50% in 1995), DNA probes for identification of M tuberculosis (68% in 1993, 79% in 1995), and BACTEC TB for susceptibility testing (65% in 1993, 71% in 1995). The percentages of E1 Survey participants who used a fluorochrome stain for detection of acid-fast bacilli and both a liquid and a solid medium for mycobacterial culture were lower than the percentages of E Survey participants who used these methods. Among participants who responded in all years being compared, the percentage processing respiratory specimens at least 7 times per week increased from 26% in 1992 to 30% in 1993 and 43% in 1995 (P


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