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Journal of Tropical Pediatrics 2002 48(1):29-32; doi:10.1093/tropej/48.1.29
© 2002 by Oxford University Press
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Predictive Value of Tuberculin Induration at 24 h in Healthy Schoolchildren

V. Tiroumourougane Serane1, P. Nalini1 and S. Mahadevan1

1 Department of Pediatrics, JIPMER, Pondicherry, India

Tuberculin (1 TU PPD RT23 Tween 80) was administered to 500 healthy schoolchildren, aged 5–9 years. The induration at 24 h was compared with that at 72 h. The mean (standard deviation) induration of the tuberculin reaction at the end of 24, 48 and 72 h was 4.5 (6.75), 4.4 (7.11) and 4.0 (6.91) mm, respectively. When the tuberculin reaction was 0–9 mm, a significant difference was noted between the 24- and 72-h reading (p = 0.0001). There was no difference in the size of the tuberculin reaction between the 24- and 72-h readings when the reaction size was ≥ 10 mm (p > 0.05). Considering a tuberculin induration of < 10 mm as negative tuberculin reaction for our reference population in South India, the sensitivity, specificity, positive predictive value and the negative predictive value in our study for the 24-h reading were found to be high. The predictive value of 24-h induration was not affected by age. Reading and interpretation of tuberculin test after 24 h needs due consideration in clinical practice.


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