cytology

This newer HPV test is regarded as a better indicator than cytology of identifying who is a higher risk of developing cervical cancer.

This removes the need for all samples to also undergo cytology which is time consuming and clogs up the screening system.

BBC News NI can also reveal that the Western Health Trust is now carrying out an "external review of cytology slides" that have been reported as serious adverse incidents.

The Belfast Trust, which was to review the slides, has had its cervical cytology service accreditation suspended, BBC News NI understands.

If HPV is detected a cytology test is used to check for any abnormal cells.