The families of children who received blood products not properly screened for Hepatitis C from the Our Lady's Children's Hospital in Crumlin are to be contacted by the hospital today.

The hospital also plans to hold a press conference on the matter.

It was revealed that between 70 and 100 children received the improperly screened blood products between 1991 and 1994.

A review of the screening procedure used at that time showed it to be only 35% accurate.

The hospital has said, however, that it is unlikely that any infection occured from the blood products.

Speaking on RTÉ Radio's Morning Ireland, Dr Finn Breathnach, Consultant Paediatric Oncologist at the hospital, said he would be astonished if any infection had occurred.

Screening for the Hepatitis C virus, which can cause liver damage, was introduced in Ireland for blood products in 1991.

It is understood that a review at the hospital has discovered that the screening test it operated between that time and 1994 was not the best test available and was only around 35% accurate.

As a precautionary measure, the families are to be contacted and offered screening for the virus.

Specialists are still trying to determine who should be tested and why an inferior test was used.

The number for the Crumlin Help Line is 1800-250450.