I read with interest your article on accrediting cytology services in the NHS (Heretic, 5 March).

Clinical Pathology Accreditation (CPA) is an established programme.

Since its inception in 1992, CPA has inspected over 1,000 laboratories in the UK, covering every pathology discipline, not just cervical cytology. This represents 70 per cent of all clinical laboratories, in both public and private sectors.

Our web site lists those laboratories in all pathology disciplines currently accredited by CPA. The address is www.cpa-uk.co.uk Cheryl Blair, Executive manager, Clinical Pathology Accreditation, Sheffield.