Two plus signs for urinary vitamin C are indicative of high vitamin levels in the urine, often seen in dietary intake or high intravenous intake of vitamin C. In urine routine vitamin is only a reference value, when the vitamin level in urine is increased, it may cause false positive results of urine occult blood, urine leukocyte esterase, nitrite, etc. Therefore, when there is a positive result for nitrite, leukocyte esterase, and urine occult blood, it is necessary to compare it with urine vitamins. If the urine vitamins are negative, this suggests the presence of a positive result and the need for further treatment. However, a positive result for urine vitamins suggests that there may be too many vitamins, causing a redox reaction of the corresponding test indicator and a false positive result. This would then require a retest to confirm the diagnosis of the associated pathology. Therefore, the two plus signs for vitamins in urine, which are used as a reference value for false positives, do not have any pathological significance in themselves.