Benign familial thrombocytosis
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Updated: Oct 12, 2026

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay
Published on: September 9, 2012
1Department of Medicine, University of Wisconsin, Madison 53706.
Abstract:
A 13-year-old girl was found to have a platelet count in excess of 4 million/microliters while being evaluated for a minor bleeding episode. Her father and two sisters also had thrombocytosis. All four affected patients were asymptomatic and had no clinical or laboratory evidence of a myeloproliferative disorder other than an elevated platelet count. This represents the second reported instance of benign familial thrombocytosis.
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