Review Question - QID 215025

A 32-year-old G2P1 woman at 26 weeks of gestation presents to her obstetrician for a routine visit. She has no history of chickenpox and does not have a prior varicella vaccine. She has been receiving routine prenatal care since she found out she was pregnant at 5 weeks of gestation. She has 1 prior uncomplicated vaginal delivery. The patient notes that she was babysitting her niece and nephew a few days ago who were home sick from school with a very itchy, erythematous, vesicular body rash. Her temperature is 98.9°F (37.2°C), blood pressure is 130/89 mmHg, pulse is 98/min, and respirations are 12/min. Physical examination reveals a gravid uterus with a fundal height of 26 cm. No rashes are noted. Which of the following is the most appropriate next step in the management of this patient?