The BMA voiced concerns that patients don't have enough information about electronic patient records and it is too hard for them to opt out if they want to.
Currently anyone who wants to opt out of an SCR has to inform their GP or complete a form from the internet or requested through an 0845 national call centre, the BMA said.
Dr Grant Ingrams, chairman of the joint RCGP/GPC GP IT Committee, said: ‘While we believe it has the potential to improve both the quality and safety of patient care, we are concerned at the speed because it means patients are very unlikely to be aware of what they are automatically being enrolled into.'
He added: ‘We would like to see it rolled out carefully area by area in a properly supported and evaluated fashion. This should ensure it improves patient care in the way it is intended to, whilst also protecting patient confidentiality.'