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Thrombocytopaenia is a decrease in the number of platelets in the blood - it reduces the ability of the blood to clot and is thus a bleeding diathesis. It is defined as a platelet count less than 100 x 10^9/L (<100,000 per cubic mm).
In addition, it is important to consider also the causes of apparent thrombocytopaenia - i.e. conditions where there is platelet dysfunction.
Neonatal thrombocytopaenia has a modified differential diagnosis.
A suggested management of low platelet count in adults (1):