The nurse is preparing the patient for a test to determine the cause of vitamin B12 deficiency. The patient will receive a small oral dose of radioactive vitamin B12 followed by a large parenteral dose of nonradioactive vitamin B12. What test is the patient being prepared for?
a) Magnetic resonance imaging (MRI) study
b) Bone marrow aspiration
c) Schilling test
d) Bone marrow biopsy
Answer: Schilling test