[The medical expert and his standards]

The expert needs clearly outlined principles which are accepted by the majority of carefully and scrupulously working physicians. These principles are world-wide known as standards. They can be changed by progress in medical science. Their value is restricted by the fact that in the particular case with its individual peculiarities they may be of no help. Presenting a few cases, some problems for the medical expert are shown. Cardiotocography, Apgar-score, ureter, problems of organisation, the lethal outcome and the difficulties of preoperative information of the patient find particular consideration. The importance of the dialogue between physician and lawery is pointed out.