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 previously healthy 16-year-old girl comes to the physician because of fever, fatigue, and a sore throat for 8 days. She also has a diffuse rash that started yesterday. Three days ago, she took amoxicillin that she had at home. She is sexually active with two male partners and uses condoms inconsistently. Her temperature is 38.4°C (101.1°F), pulse 99/min, blood pressure 106/70 mm Hg. Examination shows a morbilliform rash over her trunk and extremities. Oropharyngeal examination shows tonsillar enlargement and erythema with exudates. Tender cervical and inguinal lymphadenopathy are present. Abdominal examination shows mild splenomegaly. A peripheral blood smear shows lymphocytosis with > 10% atypical lymphocytes. Which of the following is most likely to be positive in this patient?
assistant
Heterophile antibody test