Sputum samples are: notoriously inaccurate in diagnosing specific infections, especially TB. Cultures from sputum specimens have a similar problem & take weeks to get a result. While a positive test generally indicates active TB, a negative test may mean only that it was missed. It's important to finish the complete course of treatment. Consider other possible causes of excess phlegm as well. Dr. Anne
Answered 6/24/2016
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