Cofactor for<unk> <unk> -dependent clotting factors II, VII, IX, X
Used by liver
Fat soluble
Used by liver
Fat soluble
Nutritional<unk> 
Malabsorption (pancreatic insufficiency, celiac sprue, cystic fibrosis, etc)
Cholestasis: since it is fat soluble and needs bile salts to be absorbed
Neonates lack intestinal bacteria that produce<unk> <unk>  and therefore require supplementation at birth
If no<unk> <unk>  given, neonate at increased risk of spontaneous hemorrhage
If no<unk> <unk>  given, neonate at increased risk of spontaneous hemorrhage
Vitamin K deficiency
Too few
Heparin-Induced Thrombocytopenia 
Thrombocytopenia
Factor V Leiden
Nonfunctional
Liver disease induced coagulopathy
Aspirin