A study of nonattendance at a Dysplasia Clinic found that 20% of women who had an appointment in 1988 failed to attend the clinic during the next 18 months. Most of the nonattendance was among women who had previously been assessed at the Dysplasia Clinic. Only 6% of the nonattending women had cytological/histological evidence of CIN which remained untreated. If all women who did not default from attendance at the Dysplasia Clinic were correctly managed, then 1% of all women who have appointments made for the Dysplasia Clinic were potentially receiving inadequate management for lesions considered to have a precancerous potential. A questionnaire to the women who failed to attend these appointments identified pregnancy and seeking management elsewhere as the most commonly stated reasons for the nonattendance.