A plus sign for vitamin C in a routine urine test indicates a positive result. Vitamins are water-soluble, appear in the urine is generally very normal, positive may be in the urine routine examination before, taking vitamin content is relatively high in food or drugs, that is, the body produces too much vitamin C, it can be discharged with the urine, urine is also acidic, under normal circumstances do not stress too much, there is no great clinical significance. But there is this situation it is meaningful, that is, if there is the possibility of urinary tract infection, vitamin C positive and accompanied by positive nitrite, while the white blood cell elevation is also more, for the clinical diagnosis of urinary tract inflammation is meaningful.