Which of the following patients is most likely to have iron deficiency anemia as the cause of microcytic anemia?
- A 7-year-old child with family history of anemia and normal ferritin
- A 60-year-old man with splenomegaly and target cells on smear
- A 25-year-old woman with heavy menstrual bleeding
- A 45-year-old patient with chronic rheumatoid arthritis
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Which laboratory test is most specific for diagnosing iron deficiency anemia? Drop down in the comments below 