Urea reagent is used for determination of Urea/Blood Urea Nitrogen based on enzymatic method using Urease. Urea 200 is a two reagent system using two step procedure with linear up to 350 mg% & determined in 8 minutes. chromogen solution is stable for 6months at 2-8°C after opening. 6 to 24 mg/dL (2.1 to 8.5 mmol/L ) is considered as urea normal range.