how long is a mantoux test good for
Mantoux test. 1  The Mantoux skin test consists of an intradermal injection of one-tenth of a milliliter (ml) of PPD tuberculin. 2  The size of induration is measured 48â72 hours later. 3  Mantoux test injection site in a subject without chronic conditions or in a high-risk group clinically diagnosed as negative at 50 hours.