The Hospital Authority said in a blog that the cross-border organ-matching scheme will not affect the original waiting list for organ donations in Hong Kong or the mainland.
The authority's Chief Executive, Tony Ko, said on Saturday that the cross-border mechanism will only come into place when organs of local donors cannot be matched with suitable patients in the queue.
He also wrote that the chances of organs coming to Hong Kong are believed to be far greater than of organs from the SAR going to the mainland.
Ko said Hong Kong and the mainland are continuing to discuss the scheme to strengthen cooperation and save lives.
More than 20 organ transplant experts from the authority travelled to Guangzhou last month to learn more about their organ allocation and sharing computer system used across the country.