Update - 4pm: The Department says it is keeping a close eye on the well-being of Mr Halawa.
His family in Dublin say he has been moved to a prison hospital amid reports his heart condition is getting worse.
Minister for Foreign Affairs, Charlie Flanagan, says his health remains paramount.
Mr Flanagan said: "I understand that these medical tests are underway, we are in contact with the authorities in Egypt.
"I am very anxious that they very best medical treatment is being made available to Ibrahim."
Earlier: The Irish Ambassador to Egypt is to visit Ibrahim Halawa - in a prison hospital.
The Dubliner - who has been in jail without trial for four years - is on hunger strike and is now refusing water.
His family say they are extremely concerned for his welfare and his heart condition is deteriorating.
In a statement the Department of Foreign Affairs says his long-running and complex consular case continues to be a top priority for the Government.