Here are some ...: AZO test result may differ from different specimen because the urine freshness, its duration inside bladder (> 4 hrs), possible use of vitamin C, adequacy of urine collection to avoid contamination, etc. So, one has to realize the presence of factors affecting this test leading to false (-). Besides, urine culture from properly collected fresh urine is the "ultimate" test for confirmation, ...
Answered 6/10/2018
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