It has been reported that doctors at a San Francisco hospital on Friday successfully performed kidney transplant surgeries in a rare organ donation chain that gave six patients new kidneys.

Hospital spokesman Dean Fryer said in a statement that a group of 12 donors and recipients, aged 24 to 70 years, is now recovering well after undergoing kidney transplants at California Pacific Medical Center.

Fryer said this was the largest kidney swap in the 44-year history of California Pacific's transplant center. Back in 2011, the hospital became the state's first to perform five-way swap, he added.

He said all the surgeries were performed smoothly without any obstacles. The donors will be discharged from the hospital care in two to three days whereas the recipients will be released in three to five days.

Further giving details of the operation procedure, he said that the first round of the operations began on Thursday. All the surgeries were completed by late Friday afternoon, Fryer said.

A total of five surgeons and dozens of hospital staff were on duty for two days when the transplant procedure was going on, he said.

Among the donors list includes Zully Broussard, 55, of Sacramento, California, who was there to donate kidney to a friend but her kidney didn't match with her friend's.

According to hospital officials, Broussard was so desperate to donate her kidney so she was matched with a man she did not know from Benicia, California.

Transplant surgeon Harish Mahanty, speaking about Thursday's patients at a news conference Friday, said, "So far, everyone is doing very well. The donors are actually making their way around the hospital. This couldn't have started without that wonderful altruistic donor".