A nurse is caring for a client who the provider suspects might have pernicious anemia. The nurse should expect the provider to prescribe which of the following diagnostic tests?

A. Haptoglobin: This test is used to evaluate for hemolytic anemia, not pernicious anemia. B. Schilling test: The Schilling test measures vitamin B12 absorption with and without intrinsic factor. Pernicious anemia results from a lack of intrinsic factor, leading to poor vitamin B12 absorption. C. Antinuclear antibodies: ANA testing is used to evaluate for autoimmune disorders such as systemic lupus erythematosus, not pernicious anemia. D. Sweat test: The sweat chloride test is used to diagnose cystic fibrosis, not anemia.