• In reactive thrombocytosis treat the underlying condition.

• Unusual for treatment to 5 the platelet count to be necessary in a patient with reactive thrombocytosis.

• Consider low dose aspirin (or if contraindicated, dipyridamole).

• Reactive thrombocytosis is generally transient.

• If secondary to iron deficiency—review FBC after iron therapy: the platelet count normalises if thrombocytosis was due to iron deficiency.

• Iron deficiency may have masked PRV—this will be revealed by iron therapy.

• If impossible to define the cause of thrombocytosis then a watch-and-wait policy should be followed in an asymptomatic patient.

• If MPD is suspected—ffl Essential thrombocythaemia, p250.

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