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 crying 4-year-old child is brought to the emergency department with a red, swollen knee. He was in his usual state of health until yesterday, when he sustained a fall in the sandbox at the local park. His mother saw it happen; she says he was walking through the sandbox, fell gently onto his right knee, did not cry or seem alarmed, and returned to playing without a problem. However, later that night, his knee became red and swollen. It is now painful and difficult to move. The child’s medical history is notable for frequent bruising and prolonged bleeding after circumcision. On physical exam, his knee is erythematous, tender, and swollen, with a limited range of motion. Arthrocentesis aspirates frank blood from the joint. Which of the following single tests is most likely to be abnormal in this patient?
assistant
Partial thromboplastin time (PTT)