What additional data would be helpful in determining the etiology

A 29-year-old woman presents with generalized fatigue. Her physical examination reveals a heart rate of 115 beats/minute, blood pressure of 115/75 mm Hg, and respiratory rate of 28 breaths/minute. Her skin and nail beds are pale. Her laboratory results include red blood cell count 3.0 × 106/μL, hematocrit 30%, hemoglobin 9 g/dL, and a decrease in serum ferritin levels.

 

  • What disorder do you suspect this woman has?
  • What additional data would be helpful in determining the etiology of her condition?