08-05-2010, 06:43 AM
Just a heads up and a good fyi for lots of people. A friend of mine tested positive on a tb test earlier, but demanded a retest. He took benadryl this time since he tends to have allergies and is allergic to mosquito bites. The second reading if positive should have been more severe since he had already had the first one. Instead it was just a small faint red dot, no swelling etc..He thinks he was allergic to the serum they used. If you or child tends to have a lot of allergic reactions it might be a good idea to take benadryl before having the test. He just saved himself 9 months of drug therapy.