Tony O'Brien is appearing before an Oireachtas committee where he's been accused of dancing on the head of a pin to avoid resigning.
In a statement this evening, the HSE said Mr O'Brien meant to step down from his position with effect from close of business on Friday.
Mr O'Brien added that in spite of "the clear communication failures surrounding the CervicalCheck Audits", he is "confident" that on the completion of the Scally Review, the value and quality of the CervicalCheck Programme will be shown.
Mr O'Brien said that he looks forward to engaging with Dr Gabriel Scally, who is heading up the scoping inquiry into the controversy, and will cooperate fully with him.
Musk shows first underground LA tunnel for high-speed Loop system
Elon Musk has given the first glimpse of his underground Los Angeles tunnel, and said free rides will start in just a few months. Tesla Chief Executive Elon Musk smiles as he attends a forum on startups in Hong Kong, China January 26, 2016.
CPL said it is one of two U.S., and two Irish laboratories, that have provided Pap smear testing for the Irish cervical screening program since 2008. He emphasised his fullest support for Minister Harris in this regard.
The Minister for Health, Simon Harris, thanked Mr O'Brien for his "many years of dedicated public service".
The US laboratory that settled a High Court action taken by Vicky Phelan over her incorrect smear test results has said that what happened to Ms Phelan and her family was tragic and that it deeply regrets the outcome.
The IMO says it's agreed a programme for women with concerns to visit their Global Positioning System and if required, organise for a repeat smear test. The mum-of-two wasn't diagnosed for another three years.