History and context
An 8-year-old boy has knee pain and swelling after minor trauma. A maternal uncle had similar episodes.
Reason as you would in the laboratory: recognize the phenotype, select tests, interpret the set, and only then confirm the hypothesis.
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Solve a case without skipping steps: hypothesis before tests, initial panel, integrated interpretation, and targeted confirmation.
An 8-year-old boy has knee pain and swelling after minor trauma. A maternal uncle had similar episodes.
Hemarthrosis and deep hematomas; no diffuse petechiae or spontaneous gum bleeding.
Which mechanism best explains the pattern? Record a hypothesis before looking at the laboratory.