ibraheem
Forum Junior
Topics: 5
Posts: 40
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hi friends:
Canany one tell me in vit.K def.bleeding in newborn the prothrombine time PT, only or PT and aPTT are prolonged?
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| chemamr
Moderator and PGY1
Topics: 703
Posts: 4,441
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PT is prolonged and is more sensitive.
aPTT can be prolonged too.
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| ibraheem
Forum Junior
Topics: 5
Posts: 40
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Thanks friend 
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| phuluong2k
Forum Fanatic
Topics: 714
Posts: 2,008
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some more input
Vit K deficiency cause def of II, VII, IX, X
Factor VII has the shortest half-life (3-5 hours) of the known coagulation
So firstly PR is prolonged ( VII deficiency), later aPTT is prolonged too
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