Review Question - QID 212388

A 55-year-old man presents to his primary care physician with a 2-month history of fatigue. He says that he has been feeling tired, even after mild exertion, and decided to be evaluated because it has begun interfering with his job as a construction worker. He reports that he has been feeling numbness and tingling in his feet and has been tripping more frequently. His past medical history is significant for hypertension and type 2 diabetes well-controlled on metformin. His surgical history is significant for weight-loss surgery 2 years ago. Physical exam reveals bilateral vibration sensory deficits as well as conjunctival pallor. Selected lab results are presented as follows:

Hemoglobin: 9.1 g/dL
Hematocrit: 27%
Platelet count: 265,000/mm^3
Mean corpuscular volume: 112 µm^3
Reticulocyte count: 0.19%

Which of the following findings would most likely also be seen in this patient?