Review Question - QID 109685

A 32-year-old woman presents to her primary care physician for generalized fatigue. She states that she is doing well but that she always feels tired. She started exercising to have more energy, finds that she tires easily, and has not felt motivated to return to the gym. She is doing well and is excelling at her job. She recently started a vegan diet in order to try and become healthy. She is currently struggling with dating and is unable to find a compatible mate and feels hopeless about this. The patient has a past medical history of uterine leiomyomas. Her temperature is 99.5°F (37.5°C), blood pressure is 100/68 mmHg, pulse is 80/min, respirations are 14/min, and oxygen saturation is 98% on room air. Laboratory values are ordered as seen below.

Hemoglobin: 10 g/dL
Hematocrit: 32%
MCV: 78 µm^3
Ferritin: 10 mg/mL
Total iron binding capacity: 620 mcg/dL
Leukocyte count: 6,500/mm^3 with normal differential
Platelet count: 190,000/mm^3

Serum:
Na+: 141 mEq/L
Cl-: 102 mEq/L
K+: 4.1 mEq/L
HCO3-: 24 mEq/L
BUN: 20 mg/dL
Glucose: 99 mg/dL
Creatinine: 1.1 mg/dL
Ca2+: 10.2 mg/dL
TSH: 4.7 mIU/mL
AST: 12 U/L
ALT: 10 U/L

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