Review Question - QID 216475

A 26-year-old man presents to the emergency department with fatigue and dark urine over the past day. He was recently diagnosed with cellulitis of his left leg, for which he was prescribed trimethoprim-sulfamethoxazole. He denies having nausea, vomiting, or diarrhea. He has no significant medical history and does not currently take any medications. His temperature is 98.6°F (37°C), blood pressure is 115/72 mmHg, pulse is 98/min, and respirations are 14/min. Physical exam reveals conjunctival icterus, bilateral flank tenderness, and erythema of the left leg. Laboratory workup is performed, and the results are shown below:

Serum:
Hemoglobin: 7.2 g/dL
Total bilirubin: 2.1 mg/dL
Direct bilirubin: 0.8 mg/dL
Lactate dehydrogenase: 470 U/L
Glucose-6-phosphate dehydrogenase: 7 U/gHb (normal: 6-20 U/gHb)

Which of the following would most likely be seen on a peripheral blood smear in this patient?