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 5-year-old girl is brought to her pediatrician by her mother. The mother is concerned about a fine, red rash on her daughter’s limbs and easy bruising. The rash started about 1 week ago and has progressed. Past medical history is significant for a minor cold two weeks ago. The girl was born at 39 weeks gestation via spontaneous vaginal delivery. She is up to date on all vaccines and is meeting all developmental milestones. Today, she has a heart rate of 90/min, respiratory rate of 22/min, blood pressure of 110/65 mm Hg, and temperature of 37.0°C (98.6°F). On physical exam, the girl has a petechial rash on her arms and legs. Additionally, there are several bruises on her shins and thighs. A CBC shows thrombocytopenia (20,000/mm3). Other parameters of the CBC are within expected range for her age. Prothrombin time (PT), partial thromboplastin time (PTT), and metabolic panels are all within reference range. What is the most likely blood disorder?
assistant
Immune thrombocytopenic purpura (ITP)