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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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How Long Should A Red Dot Last After Receiving A TB Test?

Hi there,
I was just curious as to how long one should notice the red dot after receiving a TB test? I had it checked and it came back negative, but this is the first time the little red dot hasn't disappeared. I've lived in 3rd world countries for five years, but have been back in the US for 1.5 years with no symptoms of TB.
Tue, 11 Feb 2014
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Orthopaedic Surgeon, Joint Replacement 's  Response
hi
the test you are talking about is known as tuberculin test and it is read after 48 hour after injection.if it is 10 or more than 10mm we call it positive. usually it disappear of its own in a week time. wish you good health and take care.
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How Long Should A Red Dot Last After Receiving A TB Test?

hi the test you are talking about is known as tuberculin test and it is read after 48 hour after injection.if it is 10 or more than 10mm we call it positive. usually it disappear of its own in a week time. wish you good health and take care.