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A preliminary test, called an "AFB smear," will be performed immediately on the sample, and if the results are positive, treatment is usually started right away. A negative AFB smear result, however, does not rule out tuberculosis.
The final results of the gastric culture test may not be known for 6 weeks, as it may take that long for the tuberculosis microoganism to grow. Your physician will decide whether to start treatment before the test results are known.
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