This version of the course is no longer available.
Need multiple seats for your university or lab? Get a quote
The page below is a sample from the LabCE course . Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

Learn more about (online CE course)

The nitrite test on the urine reagent strip detects the presence of nitrate-reducing bacteria (ie, gram-negative bacteria). Bladder infections are usually caused by gram-negative bacteria. These bacteria reduce nitrate to nitrite when urine remains in the bladder at least three hours. Gram-positive bacteria do not produce a positive nitrite reaction because they lack the enzyme nitrate reductase that converts urinary nitrate to nitrite.

Nitrite is not present in urine under normal circumstances.