The Labour Party says damning report on healthcare in prisons amounts to evidence of human rights abuse.
The Ombudsman's report praises medical staff but says they have limited resources, outdated equipment and unsuitable facilities.
Its investigation found:
* Mental healthcare was inadequate or unsuitable.
* Dental services were inadequate.
* Transgender prisoners with health problems were "unreasonably" kept in male prisons.
* Increasing prisoner numbers was seriously stretching health funding.
"The failure of authorities to provide appropriate and adequate health services to prisoners is both a human rights abuse and a dereliction of duty," says Labour's justice spokesman Charles Chauvel.
Health spokeswoman Maryan Street says issues raised in the report can't become "just another problem in the too-hard basket".
Maori Party MP Te Ururoa Flavell said its findings made for disturbing reading, especially in the provision of mental healthcare.
"The report has identified that there are deficiencies in the way that healthcare is provided to these prisoners, and yet the incidence of mental health and drug and alcohol problems is much higher than for the wider community."
The government is considering the report.
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