Vitamin C (+) in the urine test suggests an increased vitamin level. An increased level of vitamin C in a urine test may be related to factors such as dietary intake or supplementation with vitamin C. There is no definite significance. In a routine urine test, vitamin C is used as a contrast agent to confirm whether certain values in the test result are false positives. If there is more vitamin C present in the urine, it may lead to items such as occult blood or nitrite in the urine, causing the reagent to revert and a positive result. But at this point it is the result of a higher amount of vitamin C interfering with the agent, not the result of having the disease in question. Therefore, vitamin C in the urine, as a contrast agent, determines the presence of positive results for urine occult blood and nitrite. If there is a positive vitamin C and a positive nitrite and occult blood, it is considered a false positive result and requires further screening.