How is Mantoux test performed? The TST is performed by injecting 0.1 ml of tuberculin purified protein derivative (PPD) into the inner surface of the forearm. The injection should be made with a tuberculin syringe, with the needle bevel facing upward. The TST is an intradermal injection. How do you know if your TB skin test is positive? If you have a raised, hard bump or there's swelling on your arm, you have a "positive" test. That means TB germs are in your body. But it doesn't necessarily mean you have active tuberculosis disease. If you don't have a reaction, your test is "negative" and you don't have TB germs in your body. How is a TB skin test read? Doctors should read skin tests 48-72 hours after the injection. The basis of the reading of the skin test is the presence or absence and the amount of induration (localized swelling). A negative test does not always mean that a person is free of tuberculosis. We are providing all Diagnostic Facilities in our center.... We have Ultramodern Songraphy Facility We have 2 D Echo Facility We have Doppler Facility We are doing All Pathology Tests We have Digital X-ray We have ECG facility Visit us @ "diagnosticcentrepune.in"