CT shows that it is tuberculosis, and the results of the skin test are valid after three days?

CT scan shows tuberculosis, and whether the results of PPD skin test after 3 days are valid depends on a case-by-case basis. If the patient is already infected with Mycobacterium tuberculosis at the time of the PPD skin test, a positive response may not be detected.

1. PPD skin test: PPD skin test is a method for diagnosing tuberculosis by injecting a pure protein derivative of tuberculin. Typically, the test is performed on day 7-9 of vaccination, when changes in induration and redness can be observed to determine if tuberculosis infection is present.If the patient's condition is severe and symptoms such as fever and cough occur, it may lead to a falsely negative result of the PPD skin test.

2. CT examination: CT examination is an imaging examination method, which can clearly see the specific conditions of lung tissue, trachea, bronchi and other parts through X-ray scanning, so as to determine whether there is pulmonary tuberculosis lesions. If the patient is diagnosed with pulmonary tuberculosis, it can be treated with drugs such as rifampicin capsules, isoniazid tablets, etc., under the guidance of a doctor.

It is recommended that patients seek medical attention in a timely manner, improve relevant examinations, and follow the doctor's instructions for symptomatic treatment after clarifying the cause. In daily life, we should pay attention to rest, avoid overwork, and pay attention to maintaining a good attitude, which is conducive to physical recovery.