Urine samples
Urine samples
Urine samples
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Nitrate Reductase (Greiss) test• Mechanism Some bacteria reduce nitrates to nitrites• Methods for detection : REAGENT STRIP• Negative results : Normal• Positive results : UTI (most Enterobacteriaceaea).• False – positive : - medication-Dipstick exposed to air• False – negative : -ascorbic acid-low pH < 6,-urobilinogen ,-non fresh specimen ,-Bacteria lacking nitrate reductase enzyme