A child presents with microcytic, hypochromic anemia. The ph…
A child presents with microcytic, hypochromic anemia. The physician suspects iron deficiency anemia. Further laboratory testing reveals a normal total serum iron and iron-binding capacity; however, the zinc protoporphyrin level was very high. A urinary screen for porphyrins was positive. Erythrocytic basophilic stippling was noted on the peripheral smear. Which of the following laboratory tests would be best applied to this case?