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 10 year old boy presents with mucosal bleeding of 1 week duration. The investigation of choice that will be most useful in him is –
assistant
The correct answer is  Bleeding from mucosal surface suggests thrombocytopenia or defect in platelet function.
First do platelet count, if there is thrombocytopenia, further investigation will be required.