Test your knowledge of the diagnostic workup for hemophilia B, including why routine coagulation studies may not exclude mild disease and which laboratory test is required to confirm factor IX deficiency.
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A 67-year-old woman presented to the otolaryngologist’s office with a 2-week history of recurrent epistaxis and nasal airway obstruction limited to the right nasal passage.
Test your knowledge of the diagnostic workup for hemophilia B, including why routine coagulation studies may not exclude mild disease and which laboratory test is required to confirm factor IX deficiency.
...
