Clinical Medical Assistant Certification Exam Practice Question

Correct Answer: B

Rationale: Determining the total number of white blood cells in urine requires direct observation of the urine sample. A microscope allows for the examination of the urine at a cellular level, making it possible to count white blood cells accurately.

Option A, a chemical test strip, provides qualitative results for various substances but does not quantify cell types. Option C, a refractometer, measures the specific gravity of urine, not cell counts. Option D, a urinometer, is used for measuring urine density, which is unrelated to white blood cell enumeration. Thus, only a microscope can provide the necessary details for this analysis.