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 6-year-old boy is brought to the physician because of a 3-day history of progressive rash. The rash started on his face and now involves the entire body. For the past week, he has had a cough and a runny nose. He is visiting from the Philippines with his family. He is in first grade and spends his afternoons at an after-school child care program. Immunization records are not available. His temperature is 39.5°C (103°F), pulse is 115/min, and blood pressure is 105/66 mm Hg. Examination shows generalized lymphadenopathy. There is an erythematous maculopapular, blanching, and partially confluent exanthem on his entire body. The remainder of the examination shows no abnormalities. Which of the following is most likely to confirm the diagnosis?
assistant
Measles-specific IgM antibodies