A 55-year-old woman comes to the physician for a 2-month history of dizziness and headache. Physical examination shows mild splenomegaly. Vitals are within normal limits. Laboratory studies show:
Hemoglobin 20 g/dL
MCV 85 fL
WBCs 17,000/μL
Red cell distribution width Elevated
Pulse oximetry 94%
Which of the following is most likely to be decreased in this patient?
Erythropoietin
Glucose
Hemoglobin A2
Leukocyte alkaline phosphatase
Platelet count
