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==Defective Coagulation==
* '''Factor deficiency'''
** Often the result of a congenital deficiency in one or more of the coagulation factors.
** Gives ineffective blood clotting and development of a disease syndrome characterized by excessive bleeding. S
*** Such bleeding is usually detected following trauma or surgery.
**** May occasionally be spontaneous (e.g. into alimentary or urinary tracts).
** Often seen as familial inherited problems.
*** E.g. [[Haemostasis - Pathology#Factor VIII|haemophilia]].
* '''Vitamin K'''
** Absolute or relative deficiency of vitamin K can give rise to abnormal prothrombin levels or activity.
*** Gives defective coagulation.
* '''''Angiostrongylus vasorum'''''
** Gives defective coagulation in the dog.
[[Category:Haemostasis - Pathology]]