... , liver diseases, kidney function, and urinary tract infections. Test results can be used along with other diagnostic information to ... pH, Protein, Urobilinogen, Nitrite and Leukocytes in Urine.Test PriniciplesUrobilinogen: this test is based on the Ehrlich reaction in which p ... the alkaline medium, which produces a violet color.Blood: Hemoglobin acts as a peroxidase. It can cause peroxidase to ...