Short message service cancellation intervention to reduce integrated sexual health and HIV 'did not attend' appointment rates.

Did not attend (DNA) appointments create a significant impact upon resource and finance efficiency in the NHS. Despite introduction of short-message service (SMS) reminders to our patients, DNA rates remained persistently high. An option to send an SMS to cancel a booked appointment was piloted from 15 January to 16 April 2018 for integrated sexual health and human immunodeficiency virus (HIV) appointments.