Informed consent is a very common medical indemnity. Basically it means that the risks of the procedure, be it drugs or surgery, have been explained to you, you understand them and you agree to those risks. Legally it means that you cannot sue for outcomes that have been explained to you. In your case it may be that you will be rendered infertile and that you cannot bear children, so you cannot sue the Doctor in future for that event. This is probably of no consequence in your case. In other cases it can be, for example: if I operate to remove the tumour on your spine you may suffer permanent paralysis do you accept that risk? If so sign here. So you accept the possibility that you may be paralysed and you have no legal come back for that.