According to the guidelines for the treatment of tuberculosis issued by the CDC, the diagnosis of tuberculosis can be confirmed by any one of the following:1. sputum examination to find positive bacillus antacidus2. sputum culture positive.3 take the pathology of tuberculosis foci positive tissue.
In the clinic, because of the above evidence is difficult to find, so most of the tuberculosis patients can only call the clinical diagnosis of tuberculosis. Clinical diagnosis is based on the patient's symptoms, blood and sputum results of chest ct, ppd results, epidemiology and many other factors, if the above tests can not be confirmed, but the doctor based on clinical experience that the patient has a high likelihood of (exclude other diseases) for the case of tuberculosis, but also can be directly with tuberculosis drugs diagnostic treatment.
ppd three plus sign, can only show that you have recent contact with tuberculosis patients, and even infected with tuberculosis bacteria, but does not mean that you will have a disease (according to their own resistance), does not mean that you are a tuberculosis patient, but also according to your chest ct, symptoms and so on to determine whether you have a disease.