Nausea and vomiting of pregnancy Quiz: Ace Your Exams

A 24-year-old woman, gravida 3 para 2, at 8 weeks gestation presents to the emergency department for evaluation of persistent nausea and vomiting. The patient states that she has had difficulty tolerating oral intake and her symptoms have been interfering with her job as a software engineer. She has tried dietary modifications and switched to an iron-free prenatal vitamin without relief. She has no abdominal pain or urinary symptoms. The patient has no significant past medical history and is otherwise healthy, but did have similar symptoms during her previous two pregnancies. Temperature is 37°C (98.6°F), blood pressure is 115/60 mmHg, pulse is 88/min, respiratory rate is 14/min, and oxygen saturation is 99% on room air. BMI is 22 kg/m².  The patient has steadily been gaining the appropriate amount of weight during this pregnancy. Physical examination reveals moist mucous membranes with normal abdominal and cardiopulmonary examination. Urinalysis is negative for ketones. Which of the following is the best next step in management?