LEGISLATORS yesterday urged the Government to set a timetable for implementing an ''opt out'' organ donation system. Dr Leong Che-hung, Convenor of the Legislative Council health panel, said kidney patients needed transplants, not more dialysis machines. ''No matter how many more kidney dialysis machines we have, it will not be able to catch up with the demand of kidney patients,'' the medical representative said. ''It's like a 16-seat minibus. We can't just have people getting on board without some getting off. Only when some people die or have kidney transplants can more seats be made available for others,'' he said. An ''opt out'' system, like the one adopted in Singapore, makes it compulsory for people to give up their organs after death unless they state an objection beforehand. Acting Secretary for Health and Welfare Shelley Lau Lee Lai-kuen said it would take time for the public to change its values about organ donation. ''We cannot rush to a decision. It involves people's beliefs and different people have different opinions. The Government is now in full force launching an organ donation campaign. We think it is better to have a voluntary instead of a compulsory system,'' she said. Liberal Party legislator Lau Wah-sum said: ''We recognise the importance of public education. But how long shall we wait? We have already waited for three or four years.'' He said the Government should draw up a timetable for the implementation of the system and the public education programmes preceding this. Dr Leong also called on the Government to review its present policy which denied medication to renal patients if they had their transplants outside Hongkong. Although nobody would be turned away if they really needed medication, the Hospital Authority's director of operations Dr Yeoh Eng-kiong said the policy had been adopted because doctors considered kidney transplants carried out abroad were not very good and they had little knowledge about the treatment patients had been given. Dr Leong said he found the policy unacceptable and said nobody should be denied medical services because the quality of services they received outside Hongkong was poor. Dr Yeoh promised to review this situation. He also agreed to look into complaints about the waiting time for dialysis although he maintained the 160 kidney dialysis machines in the territory's hospitals would be enough to cope with existing demand. He said any time spent on waiting was probably due to a co-ordination or administrative problem.