We wished to determine the reasons for an average missed appointment rate o
f 28% in a highrisk pregnancy clinic. Only 41% of the 261 women in the stud
y group could be reached by telephone. The reasons included not having a ph
one, the phone had been disconnected, incorrect phone number on the chart,
the patient had moved, and the patient did not respond to the answering mac
hine message. The reasons for missing the appointment included lack of tran
sportation, scheduling problems, overslept or forgot, presence of a sick ch
ild or relative, and lack of child care. The response of patients to assess
ing prenatal care may reflect their priority of medical care relative to ot
her priorities associated with day-to-day existence. There may be a baselin
e missed appointment rate for prenatal care in lower socioeconomic populati
ons of women. The commitment of personnel time and energy to attempt to mod
ify the no-show rate should be reexamined.