reactive thrombocytosis (RT) may be responsible for more than 85% of cases with thrombocythaemia
causes of reactive thrombocythaemia (including inflammation, infection, haemorrhage and iron deficiency) must be excluded before a diagnosis of essential thrombocythaemia (ET) is made
in women of reproductive age the increased prevalence of iron deficiency should be considered
note though that, any degree of persistent thrombocytosis, whether or not it fulfils the conventional criterion of being above 600×109/l, must be pursued for the possible diagnosis of ET
Reference:
Gangat N, Tefferi A. Myeloproliferative neoplasms and pregnancy: overview and practice recommendations. Am J Hematol. 2021 Mar 1;96(3):354-66.
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