Tuberculin test variability: using the Norwegian Adrenaline-Pirquet method
OBJECTIVES: To study the agreement between two Adrenaline-Pirquet tuberculin tests and compare reactivity in groups read after 2, 3 and 4 days.
DESIGN: Responders from a random sample of 1200 men and women 20 –44 years of age in 1991 were tested with dual Adrenaline-Pirquet skin scratch tests with Norwegian-produced synthetic medium tuberculin and read after 2–7 days.
RESULTS: Of 588 subjects dually tuberculin tested, complete agreement existed in 220 (37.4%). A difference of 1 mm one way or the other was observed in 239 (40.6%), whereas a difference of less than 3 mm was found in 567 (96.5%). Using the larger of the two reactions increased the rate of tuberculin positivity (≥4 mm) by up to 8.4% compared with reading only one of the tests. No statistically significant differences were observed between subjects whose reactions were read after 2, 3 and 4 days.
CONCLUSION: Under the non-blinded conditions of this study the dual Adrenaline-Pirquet tuberculin tests demonstrated reproducibility equivalent to the internationally recommended Mantoux test, and appeared to be independent of time of reading within four days.
Keywords: agreement; test; tuberculin; variability
Document Type: Regular Paper
Affiliations: Department of Thoracic Medicine, University of Bergen, Norway
Publication date: 01 April 1999
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