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 previously healthy 9-year-old boy is brought to the physician by his mother because of a 3-month history of episodic abdominal pain. During this time, he has been more tired than usual. For the past 2 months, he has also had bulky stools that are difficult to flush. His maternal aunt has systemic lupus erythematosus. The boy is at the 31st percentile for height and 5th percentile for weight. Vital signs are within normal limits. Examination shows scattered ecchymoses across bilateral knees, the left forearm, and the upper back. The abdomen is mildly distended; bowel sounds are hyperactive. Laboratory studies show:
Hemoglobin 11.1 g/dL
Leukocyte count 4,500/mm3
Platelet count 243,000/mm3
Mean corpuscular volume 78 μm3
Bleeding time 5 minutes
Prothrombin time 24 seconds
Partial thromboplastin time 45 seconds
Further evaluation is most likely to show which of the following?"
assistant
Deficiency of clotting factor II