Dose of Tuberculin in Mantoux test is:-
TUBERCULIN TEST / MONTOUX TEST - Delayed / Type-IV hyper sensitivity reaction. Antigen used: purified protein Derivative Tuberculin: 50000 TU/mg Dose: I TU in 0.1 ml Into flexor aspect of fore arm After 3 days , measure induration < 5 mm- negative 5-10 mm - Equivocal > 10 mm- positive False Positive: Recent BCG vaccination Atypical mycobacteria infection False negative: HIV +ve ,Immunosupression Miliary TB Malignancy Peussis, measles, chicken pox. NOTE Prevalence of TB infectionis determined byTuberculin test. Prevalence of TB disease is determined by sputum smear examination
1 TU in 1 ml
1 TU in 0.1 ml
0.1 TU in 1 ml
0.1 TU in 0.1 ml
Respiratory Infections