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==Factor IV ==
==Factor IV ==
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+
Factor IV is calcium, which is necessary at several stages of coagulation. Hypocalcaemia at a level sufficient to impair haemostasis is incompatible with life.
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* Factor IV is calcium.
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** Necessary at several stages of coagulation.
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* '''Hypocalcaemia''' at a level sufficient to impair haemostasis is incompatible with life.
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** There is therefore no bleeding defect associated with hypocalcaemia.
==Factor VII==
==Factor VII==