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Respiratory Disorders (Expert Forum)

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tb test

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National Jewish Health -

This forum is for questions and support regarding lung and respiratory issues such as: Allergies, Asthma, Bronchitis, Colds - Flu, Chronic Cough, COPD, Cystic Fibrosis, Emphysema, Fibrosis, Lung Abscess, Nasal Polyps, Pleurisy, Pneumonia, Sarcoidosis, Sinusitis, Tuberculosis

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tb test

by gretel56, Dec 01, 2007 08:51AM

Tags: tb test reaction

had a tb skin test done 24 hours ago. No sign of hard, raised bump, but there is a significantly wide flat 'hive' or wheal (about 4 inches in diameter) around the injection site, with a more pink than red center (about 1 inch in diamter.) I was tested in the same manner (two shot test) about two months ago - both negative).

Would this be considered a positive reaction?

Doctor's Answer

by National Jewish Health

, Dec 04, 2007 05:28PM

This would not be considered a positive reaction. The reaction is commonly read at 48 and 72 hours. In the absence of induration >10 mm, it is considered negative.

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