A Senate inquiry has called for an urgent independent review of medical transfer procedures for asylum seekers and refugees on Nauru and Manus Island.
A parliamentary inquiry into immigration detention centres on Nauru and Manus Island has been scathing of the health care offered to asylum seekers and refugees.
A Labor and Greens-dominated Senate inquiry has been examining allegations of abuse, self-harm and neglect, as well as conditions at the centres.
It released its report on Friday afternoon, which called for an urgent independent review of medical transfer procedures.
The committee was extremely concerned patients transferred for medical treatment to the mainland were being sent back too quickly.
It also urged the government to look at ways to improve medical treatment options and mental health services for asylum seekers and refugees on both islands.
It recommended an external audit into all incident reports during the life of the detention centre contract of Transfield (now known as Broadspectrum Australia).
The report said incidents downgraded in severity needed to be analysed.
Government senators on the committee dismissed the inquiry as "a politically motivated public-relations stunt" and disputed the merit of the recommendations.
"The report is highly speculative and relies consistently on anecdotal evidence, second- and third-hand reports, and on unsupported allegations that are presented as fact," deputy chair Ian Macdonald and David Fawcett said in their dissenting report.
Labor immigration spokesman Shayne Neumann said Manus Island and Nauru were set up as regional transit processing facilities but have become places of indefinite detention because of the inaction of the Turnbull government.
Greens senator Nick McKim hit back, saying the inquiry had heard shocking evidence of appalling and unacceptable conditions at the detention centres.
He said there had been a systemic failure of the Australian government to adequately respond to the allegations.
He called for a royal commission and the immediate closure of both centres.