This appeared on one of the
Facebook groups I follow:
A 50
years old man has had a petechial rash on his lower limbs for one month and has
recently noticed abdominal bruising. He is otherwise well and there is no
splenomegaly or lymphadenopathy. Single most informative test:
a. factor
8 related antigen
b.
platelet count
c.
platelet function test
d.
prothrombin time
e vitamin
k assay
Please
explain. Thanks.
My first thought was “What a stupid question” as we would not realistically be restricted
to just one test. In the first instance we’d perform both a platelet count and
a clotting screen (not just a PT)
But it is interesting
to read the comments that other followers of the group have left. Some clearly
have a good grasp of the subject; some haven’t the faintest idea. Being able to
tell which is which helps…
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