system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 32-year-old man presents to the clinic for follow up for treatment of latent tuberculosis. He is a healthcare worker and began isoniazid 3 months ago after a routine PPD yielded a 12-mm induration. He feels otherwise well and attributes this to his vegetarian diet that he has been following for the past 4 years. His past medical history is unremarkable, but his family history is significant for a "liver disease," the specifics of which are unknown. Physical exam shows mildly reduced sensation to pinprick over the distal lower extremities. The abdomen is soft, nontender, and without hepatosplenomegaly. Laboratory studies demonstrate the following:

Serum:
Hemoglobin: 9.6 g/dL
Hematocrit: 34%
Leukocyte count: 9,200/mm^3 with normal differential
Platelets: 270,000/mm^3
Mean corpuscular volume: 77 µm^3
AST: 92 U/L
ALT: 84 U/L
Ferritin: 302 ng/mL (normal 15-200 ng/mL)
Total iron: 273 µg/dL (normal 50-170 µg/dL)
TIBC: 150 µg/dL (normal 250–370 µg/dL)

Which of the following is the most appropriate next step in management?
assistant
Pyridoxine supplementation