How to do the tuberculin test

TB test is to take a small amount of tuberculosis through subcutaneous injection into the human body, in 48-72 hours after observation of the results, you can initially determine whether infected with tuberculosis. If the patient has no skin mound or skin mound below 5mm, it is negative. In 5- 9 mm is weak positive, may be vaccinated or previously infected. If it is 10-19mm, suggesting that there may be infection at present.