Independent TD Clare Daly said she should face the full rigours of the law if found guilty of drink-driving.
The Dublin North representative admitted she had been drinking whiskey before being pulled over by gardai on the South Circular Road, in Dublin's south inner city.
It is understood Ms Daly was detained at the scene after she refused to give a breathalyser sample.
She was taken to Kilmainham Garda station on suspicion of driving while over the limit, where she gave either a blood or urine sample.
The tests have been sent to the Garda road safety bureau and the results are not expected for around another two weeks.
Ms Daly said she had taken a hot whiskey for a cold before making her way home.
"I was travelling in an area of south Dublin that I'm unfamiliar with, I took an illegal turn and was pulled in by the gardai on foot of that," she told RTE.
"I had been with family and was given a hot whiskey for a cold.
"If that brought me over the limit, then that's obviously a very serious mistake on my part and one which I take full responsibility for."
Ms Daly said she was surprised that details of the incident were leaked without any charges having been brought or confirmation of her being over the limit.