The hospital's director of physician training, Dr John Schollum, said usually only three or four candidates attempted the examinations, which were so difficult the overall pass rate was between 60% and 70%.
This year, all Dunedin candidates passed.
Although Dunedin had achieved a 100% pass rate before, having such a high number sitting the theory and practical examinations was unprecedented, he said.
He put the success down to much hard work from the registrars and about 50 medical consultants at the hospital and support from the department of medicine at the University of Otago's medical school.
Dr Schollum and the doctors praised the involvement of patients in the training programme.
Successful candidate Dr Brendan Arnold said the doctors were grateful for the participation of patients, some of whom volunteered an extraordinary amount.
The candidates agreed it was rare for a patient to refuse to be involved.
Dr Tracey Putt said it was acknowledged the training offered in Dunedin was superior to other New Zealand centres.
Dr Arnold said the standard of training was a huge factor in retaining medical registrars in Dunedin. (Dunedin has few vacancies for junior doctors, unlike many other centres).
Dr Kris Krisnamurthy, who is from India and trained in Britain, said he was amazed at the commitment of the clinical staff to the training programme.
He intends to train in neurology and remain in Dunedin.
Preparation for the examinations, which are open to doctors who have been qualified for at least five years, included completion of 1000 hours of study for the theory part and consultants giving up Saturday mornings for several months to supervise training clinical examinations.
Passing allows the doctors to then choose a medical specialty to train in including neurology, cardiology, dermatology and oncology.
This training generally takes a further three years.
Five of the seven doctors seem likely to remain in Dunedin, something Dr Schollum said would benefit patients, even if some of them did later leave.
"It's very healthy for the hospital and good for patients."
Drs Putt, Arnold, Tom Boswell and Sean Coffey may train in general internal medicine, and Dr Michelle Downie in endocrinology.
It is not known which specialty Dr Charles Tie may choose.
While it had been thought the high numbers sitting the examinations this year was an aberration, Dr Schollum said it appeared there was similar interest for next year.
