Investigation Findings among Study Subjects Investigation Number Percentage PPD test
Clinical signs together with positive PPD test
, the presence of previous or active TB lesions on pulmonary X-ray, confirmed extrapulmonary TB (by microscopy or M.
There was no significant difference in age, sex, disease duration, the number of peripheral arthritis, hip involvement, PPD test
results and prophylaxis for TB.
"With the PPD test
, if you're vaccinated, you will test positive for the disease, and you can't tell if you've been vaccinated or you have the disease."
Based on our study, the ESR and PPD tests
were beneficial in predicting pulmonary tuberculosis.
The PPD test
can be reliably used in individuals who received BCG as infants.
Nine patients had a positive PPD test
, and 2 had previously been vaccinated with BCG, and they did not undergo PPD testing.
The patient replied "no." The patient indicated that she always tested positive on a PPD test
and that chest x-rays had been needed in the past to determine the activity status of the dormant TB to which she had been exposed during employment.
Once this response, called cell-mediated hypersensitivity, is established, a person's T cells 'usually will respond to the tuberculin skin test (PPD test
) and produce a characteristic red welt.
A positive DTH response to anergy testing, in conjunction with a negative PPD skin-test result, has been interpreted as evidence that the negative PPD test
result is a true negative and the person tested is not infected with M.
The earlier negative PPD test
could have been incorrectly read, or she could have been exposed and seroconverted after the initial test.