The specimens of choice for detecting urinary tract mycobacterial disease are:
a. single clean-catch midstream urine sam-ples.
b. 24-hour timed urine samples.
c. three daily clean-catch midstream urine samples.
d. biopsies of the suspected site.
C
In the case of urinary tuberculosis, definitive diagnosis requires the recovery of acid-fast bacilli (AFB) from the urine. Early morning voided urine specimens in sterile containers should be submitted daily for at least 3 days. The procedure for collection is the same as that used to collect a clean-catch midstream urine specimen for routine culture. Because of excessive dilution, higher contamination, and difficulty in concentrating, 24-hour urine specimens are undesirable.
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