A 200-page report by the Health Information and Quality Authority into baby deaths at the Midland Regional Hospital Portlaoise is to be published tomorrow morning.

The report has been approved by the HIQA board and is being sent to the Minister for Health in advance of publication.

The report has been the source of an unprecedented clash between the health watchdog and the Health Service Executive, due to its severe criticism of senior management in the executive.

The investigation was ordered by then health minister James Reilly after an RTÉ Investigations Unit report in 2014 into the deaths of five babies in the maternity unit.

The six-member HIQA team looked at the period 2006-2012.

HIQA was contacted by or was supplied information from around 80 families.

A row broke out between HIQA and the HSE in February when the health watchdog provided the HSE with a draft of the report.

The HSE threatened a High Court injunction to halt publication.

Minister for Health Leo Varadkar intervened to say the agencies should not be suing each other.

HSE Director General Tony O'Brien claimed that the draft report contained factual inaccuracies, lacked context and those criticised had not been given an opportunity to respond.

He also claimed it suggested reckless endangerment by the HSE.

A process was agreed whereby HIQA would provide more information to the HSE on its findings before publication of the final report.