A potentiometric measurement device that can be carried by the patient or user easily and it can measure the urea, phosphate and pH values in an amount of blood in every environment, such as home, office and hospital. It includes a measurement module, a control module and a communication unit. It includes at least one urea sensing unit for determination of the urea amount in blood, at least one phosphate sensing unit for determination of the phosphate amount in blood, at least one pH sensing unit for determination of the hydronium ion level in blood. It includes a control module that determines urea, phosphate and pH values in blood via the data measured by the urea sensing unit, phosphate sensing unit and pH sensing unit.
