Q. A 2-year-old child is brought to the clinic by his parents because of increasing nosebleeds over the past two weeks. His recent history is notable for a sore throat 3 weeks ago. Other than that, he has had no major medical problems and he has met all of his developmental milestones appropriately. On clinical examination, the child appears well but dermatological exam reveals scattered petechiae over his trunk. You order a CBC, which is shown below. What is the next best step in the management of this child?