TABLE 3.

Distribution, smear result, and M. tuberculosis culture of nonrespiratory specimens tested

AMTD test result	Acid-fast smear resulta	Specimen source	No. of specimens	No. of AMTD tests performedb	Resolution of discrepant result
False positive	−	Urine	1	1	Clinical diagnosis of tuberculosis; patient responded to therapy
False positive	−	Gastric washing	1	1	Clinical diagnosis of tuberculosis; patient received therapy
False positive	+	Induced sputum	1	1	Culture grew M. xenopi
False positive	−	Induced sputum	1	2	Culture grew M. chelonae
False positive	−	Bronchial washing	1	1	Could not resolve; possible contamination in test run
False negative	−	Cerebrospinal fluid	1	2	Culture grew M. tuberculosis
False negative	+	Lymph node	1	1	Culture grew M. tuberculosis
False negative	−	Lymph node	1	1	Culture grew M. tuberculosis
False negative	−	Lymph node	1	2	Possible sampling error of tissue; second AMTD on same day was positive
False negative	−	Spine	1	1	Culture grew M. tuberculosis
False negative	−	Bronchoalveolar lavage fluid	1	≥3	Determined to be a mix-up in patient specimens; result was incorrect

^a−, negative; +, positive.\

^bIncludes initial AMTD and any additional tests performed on other specimens from the same patient.