Claims for compensation following dissatisfaction with the results of medical treatment have increased in frequency over the last few years. Medical records, such as declarations of consent and operation reports, often constitute important evidence in legal proceedings, particularly in the field of surgery. Before a vasectomy is performed for the purpose of contraception, detailed information must be given on how safe this is as a method of birth control and the patient must be made aware of the importance of sperm count controls after the operation. The surgeon is held responsible if it can be shown that a failed sterilization is due to ligation of only one vas deferens or to failure to notice an accessory one. Claims for compensation can include support for children up to the age of 18 years and financial compensation to the mother in respect of the labour pains.