worth reading especially the viewpoint: 2 items: editorial (patient consent/genetics) + viewpoint (breaching patient privacy)

Rapid Online Publications

Editorial 

Alerting genetic relatives to a risk of serious inherited disease without a patient’s consent
Graeme K Suthers, Elizabeth A McCusker and Samantha A Wake
   MJA Rapid Online Publication — 24 March 2011
   http://www.mja.com.au/public/issues/194_11_060611/sut11435_fm.html

Viewpoint (blogger's opinion - excellent article)
Doctors breaching patient privacy: Orwell redux
David J Handelsman, Leo A Turner and Ann J Conway
   MJA Rapid Online Publication — 24 March 2011
   http://www.mja.com.au/public/issues/194_11_060611/han10307_fm.html