Hello and welcome to HCM, The mantoux test is done for the screening of tuberculosis. However, it is not a confirmatory test. Positive mantoux test can occur in infection with tubercle bacilli, exposure to tuberculosis (which may or may not manifest as tuberculosis) in the presence of an intact immune system. Similarly, a negative mantoux test does not rule out tuberculosis. Mantoux test has to be corroborated with other findings like a strong clinical suspicion of tuberculosis, evidence of caseating granulomas on microscopy or isolation of tubercle bacilli. Tests like TB gold, TB interferon, TB immunoglobulin, etc lack the sensitivity and specificity and some of them are even banned by the government. Despite this fact it is carried out in many labs. Your doctor is correct in visiting after a period of few weeks because a lymph node enlargement can be due an infection. In such such, the lymph node disappears spontaneously. If my answer is of help to you, kindly post your fedd back before closing the query. Dr Shailja P Wahal