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Review Question - QID 210785

In scope icon M 7 C
QID 210785 (Type "210785" in App Search)
A 7-year-old boy is brought to his pediatrician's office by his mother with a new onset rash. His mother says that the rash appeared suddenly yesterday. He is otherwise well. His medical history is unremarkable except for a recent upper respiratory infection that resolved without intervention two weeks ago. His temperature is 98.2°F (36.8°C), blood pressure is 110/74 mmHg, pulse is 84/min, and respirations are 18/min. Physical exam shows a well appearing child with a diffuse petechial rash. Complete blood count shows the following:

Hemoglobin: 12.6 g/dL
Hematocrit: 37%
Leukocyte count: 5,100/mm^3
Platelet count: 65,000/mm^3

Which of the following is the best choice in management?