Use This Case to Answer the Following Questions: ? a 5-Year-Old

Use this case to answer the following questions: ? A 5-year-old boy visits his primary care physician after an accident on his bike.It was his first accident,and he fell on his knees.His mother noticed severe swelling in his knees and elbows but thought that it was from the accident.She placed an ice pack on the affected areas and put him to rest.After a few days,the swelling had not improved,so she made an appointment to see his physician who asks him a few questions about the accident and then proceeds to perform a physical examination.The physician notes small hematomas on his elbows,knees,and his upper torso.The results from the blood draw follow.
PT: 12.2 sec (RR: 11.3-12.8 sec)
INR: 1.12
APTT: 72 sec (RR: 23-32 sec)
Platelet aggregation studies: normal aggregation with all agonists
The physician admits him to the area hospital.What should be the next course of action in investigating these results?

A) Repeat the aggregation studies
B) Start the patient on Coumadin
C) Order factor assays of the intrinsic pathway
D) Order factor assays of the intrinsic,extrinsic,and common pathways