In medical school, students learn about the excretory system and its urinary track. In this chapter, four patients have submitted urine samples. A urinalysis can determine the state of one’s health by examining physical and chemical properties of urine. Students are asked to review medical school notes regarding the interpretation of urinalysis results and once completed, examine the patients’ urine samples. This Teacher Guide chapter highlights the Before the Lesson, During the Lesson, and After the Lesson instructions and recommends that the teacher read prior to starting the lesson. To learn more about the Student Edition chapter referenced here, check out “Let’s Diagnose Them, Lab 1: Urinalysis.”