The nurse must assess the client's comprehension of prenatal diagnostic screenings. This scenario requires applying knowledge of hematological and renal laboratory parameters during pregnancy, specifically understanding how platelet counts, leukocytes, and urine analysis relate to maternal physiological changes and potential complications. Choice A rationale Normal platelet counts range from 150,000 to 450,000 mm. Platelets are essential for primary hemostasis and clot formation. Identifying low levels during pregnancy helps clinicians monitor for risks of postpartum hemorrhage or conditions like HELLP syndrome. Choice B rationale White blood cell counts, which normally range from 5,000 to 10,000 mm, indicate immune response or infection rather than anemia. Anemia is diagnosed by assessing hemoglobin and hematocrit levels, reflecting the oxygen-carrying capacity of red blood cells. Choice C rationale Urine specific gravity, typically 1.005 to 1.030, measures renal concentration and hydration status. Pregnancy-induced hypertension is primarily screened through blood pressure monitoring and the presence of protein in the urine, not the concentration of urine. Choice D rationale Erythrocyte sedimentation rate measures the speed at which red cells settle, indicating non-specific inflammation. While it can be elevated in various conditions, it is not a specific diagnostic tool for screening cancer during routine prenatal care.