What level of haematocrit requires venesection for polycythemia?

The British Committee for Standards in Haematology have published guidelines on polycythaemia [1].   This includes the following:"Consider venesection in the following circumstances: - Patients with a recent history of thrombosis, or with additional risk factors for thrombosis. (Source: NLH Question Answering Service)

Source: http://www.medworm.com/index.php?rid=144264&cid=c_183_35_f&fid=28832&url=http%3A%2F%2Fwww.clinicalanswers.nhs.uk%2Findex.cfm%3Fquestion%3D3648

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