QuestionSBA
QuestionChoice
This answer is incorrect. The activated partial thromboplastin time (aPTT) is elevated in individuals with haemophilia B.
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e
No abnormalities detected
QuestionChoice
This answer is correct. Haemophilia B is caused by a deficiency in factor IX, which is involved in the intrinsic coagulation pathway. The activated partial thromboplastin time (aPPT) assesses the intrinsic and common pathways and will be elevated in haemophilia B.
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a
Elevated activated partial thromboplastin time (aPTT)
QuestionChoice
This answer is incorrect. INR is a number derived from prothrombin time, which is normal in haemophilia A.
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d
High INR
QuestionChoice
This answer is incorrect. In haemophilia B, prothrombin time is typically normal. The prothrombin time is elevated in haemophilia A which is caused by a deficiency in factor VIII.
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c
Elevated prothrombin time (PT)
QuestionChoice
This answer is incorrect. In haemophilia B, platelet levels are typically normal.
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b
Low platelet count
Concept
Chapter
2693
3925
haemophilia
Topic
157
Haematology
14003
A 19-year-old male with a history of Haemophilia B attends A&E with a nosebleed which is still bleeding heavily after 45 minutes. In the department, he has routine blood tests.

Which of the following is the most likely biochemical abnormality found?
a