[Self-mutilation with a coumarin derivative].

The experiment of a self-injury by permanent intoxication with the coumarin derivative Warfarin is described. Various isolated haemostatic defects as differential-diagnostically demarcated causes for the leading symptom decrease of the value of the thromboplastin time which concern the effect of coumarin are mentioned. It is referred to the coagulation-analytic and chemical-toxic methods of proof of coumarins.