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Blood disorders specific to pregnancy 

Blood disorders specific to pregnancy
Blood disorders specific to pregnancy

David J. Perry

and Katharine Lowndes


July 30, 2015: This chapter has been re-evaluated and remains up-to-date. No changes have been necessary.

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date: 27 September 2021

Plasma volume increases by more during pregnancy than does red cell mass, leading to haemodilution and a fall in the haematocrit from about 40% to 33%, with the nadir usually reached at 24 to 32 weeks gestation. Anaemia during pregnancy is defined as a haemoglobin concentration of <10.5 g/dl during the second and third trimesters....

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