As Lynda says the underpinning ethic is current/contemporary and informed. There is no standard time. Some companies use 3 months as a guide however if it is clear that consent was given for a different issue new informed consent would be needed. Regards Carr ******************************** Please remove this footer before replying. OCC-HEALTH ARCHIVES: http://www.jiscmail.ac.uk/lists/occ-health.html CONFERENCES AND STUDY DAYS: http://www.jiscmail.ac.uk/cgi-bin/filearea.cgi?LMGT1=OCC-HEALTH