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Once you have a positive PPD why cant you ever get it again and have to have a chest xray instead?
Wiki User
ā 14y ago
Once someone tests positive for the PPD skin test, that person will (almost)always remain positive for the rest of their life. Then, there is no sense in placing a PPD skin test again, as you already know that it will be positive. The reason for doing the chest x-ray instead is to make sure that there is no evidence of active tuberculosis disease in the lungs. Not all patients with a "positive PPD" will have an active lung disease from TB, which can be contagious.
Wiki User
ā 14y ago
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