Thrombocytosis
Normal platelet count <450 × 109/L; platelet counts
>1000 × 109/L may cause
thrombosis or bleeding when platelets are dysfunctional.
Almost always, thrombocytosis in
infants and children is reactive. Increased
production occurs with
·Acute or chronic infection.
·Acute or chronic haemorrhage.
·Trauma or surgery.
·Kawasaki’s disease.
·Iron deficiency anaemia.
·Certain malignancies, e.g. Wilm’s
tumour.
·Any inflammatory disease, e.g.
ulcerative colitis.
·Primary myeloproliferative
disorder, e.g. essential thrombocytheaemia (ET) or in association with chronic
myeloid leukaemia (CML).
Post-splenectomy. On examination
look for signs of iron deficiency anaemia, bruising or bleeding, splenomegaly,
signs of Kawasaki’s disease and general ill health. The most common scenario is
for the child to be totally well having recovered from an acute infection and a
follow-up FBC shows a raised platelet count.
·FBC:
e.g. WCC ‘rise’in infection or signs of iron deficiency anaemia.
·CRP/ESR:
‘rise’in
inflammatory/malignant conditions.
·Bone marrow aspirate only ever
indicated if primary myeloproliferative disorder (MPD) such as essential
thrombocytheaemia is suspected (which is very rare).
·Treat underlying cause.
·Watch and wait in reactive cases,
as requires no treatment.
·Give aspirin in Kawasaki’s disease
(one of the few indications for aspirin in children).
Reactive thrombocytosis generally
has an excellent prognosis. Primary causes are very rare and have a variable
prognosis. They are best managed by a paediatric haematologist.
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