The standard Mantoux test in the UK consists of an intradermal injection of 2TU of Statens Serum Institute (SSI) tuberculin RT23 in 0.1ml solution for injection. The Mantoux test is used to detect latent TB infection, to detect recent infection (as shown by conversion of the Mantoux from negative to positive) and as part of the diagnosis of TB disease. Mantoux testing is not recommended for people who have had a past Mantoux reaction of 15 mm or greater or in people who have had previous TB disease.