The Medical Council has cancelled the registration of Dr Vincent Osunkwo after finding him guilty of professional misconduct and poor professional performance last December.
The Council said today that its decision was confirmed by the High Court on 28 April.
The sanction is the most serious that can be imposed on a doctor.
The fitness to practise inquiry found there was a serious falling short of the standards of practise expected of the senior house officer in relation to a number of allegations.
The Health Service Executive had referred Dr Osunkwo to the Medical Council.
The doctor from Nigeria had worked at the Midland Regional Hospital in Portlaoise.
The inquiry in December heard that in March 2009 he allegedly tried to read a spinal X-ray while holding it upside down.
On another occasion he reportedly asked nursing staff if a patient's pulse rate reading of 165 beats a minute was high.
It was also claimed that he made an excessive number of attempts to take a blood sample.