In routine urine tests, VC is the amount of vitamin in the urine. It is a comparative reference indicator, which means that it determines whether there is an increased level of vitamin C in the urine, and further determines whether there is a positive result of vitamin C reducing nitrite, leukocyte esterase, and occult blood in the urine. If there is a positive indication of vitamin C in the urine along with a positive occult blood or a positive nitrite, a false positive result is to be considered. This is a false positive result due to the redox reaction associated with the vitamin C in the urine, and it is recommended that the urine be retrieved for retesting on a later date. If the urine is negative for vitamin C and positive for nitrites or positive for occult blood, this suggests that there is indeed an infection or bleeding lesion. This is not a false positive due to high vitamin C levels in the urine, but requires a urine culture and urinary ultrasound to clarify the exact cause.