How to Reduce DNAs in a Private Clinic

A DNA, "did not attend", is the NHS term for an appointment that a patient simply did not turn up to, and private practice adopted it because it describes the problem exactly: no cancellation, no warning, an empty slot and a clinician waiting. Across 715 UK private clinic owners surveyed for the HMDG Private Practice Barometer, clinics running automated appointment reminders reported a DNA rate of 6.3%, against 11% for clinics without them. That gap, on a diary of 150 appointments a week, is seven empty slots every week.

This guide is about closing it in a private clinic specifically: a physiotherapy practice, an aesthetics clinic, a counselling service or a private GP, where every DNA is a direct loss rather than a line in a service report. It covers how to measure your DNA rate properly, why patients DNA in the first place, and eight steps that bring the number down and keep it down.

What counts as a DNA, and what doesn't

A DNA is an appointment that was booked, not cancelled, and not attended. That definition matters because the fixes differ:

• A DNA cannot be refilled. The slot was lost the moment the patient didn't arrive.
• A late cancellation (inside your notice period) can often be refilled from a waitlist, so it is a smaller loss and needs a different response.
• A reschedule is not a loss at all if the original slot is refilled.

Measure the three separately. Clinics that lump them together end up treating a rebooking problem as an attendance problem and reaching for penalties when a better reminder would have done.

How to calculate your DNA rate

DNA rate = (appointments missed without notice ÷ appointments booked) × 100

Use a calendar month, break it down by clinician, site, appointment type and weekday, and keep the previous quarter as your benchmark. The overall figure tells you how big the problem is; the breakdown tells you where to start. A clinic running at 5% overall will often find one appointment type, new-patient initial assessments booked three weeks out for example, running at 12%.

Setting	Rate	Source
UK private clinics with automated reminders	6.3%	HMDG barometer, 2026
UK private clinics without	11%	HMDG barometer, 2026
Healthcare worldwide, 105 studies	around 23%	Health Policy, 2018

Why patients DNA

The research is consistent, and none of it suggests patients don't care:

• They forgot. Still the most common reason, and the one reminders fix outright.
• They booked a long time ago. A long gap between booking and appointment is one of the strongest predictors of a DNA in the Health Policy review of 105 studies.
• They have DNA'd before. Past behaviour is the other strong predictor, which makes it a useful early warning.
• Rearranging was harder than not coming. If changing a slot means phoning reception during working hours, some patients will let the appointment lapse rather than make the call.
• They felt better, or worse. Especially in physiotherapy and counselling, where the reason for attending can change between booking and visit.

Every step below answers one of those.

1. Send automated reminders, and make the reply do the work

Reminders are the biggest single lever and the best evidenced. In the Cochrane review, attendance rose from 67.8% to 78.6% when patients received a text reminder, and texts performed about as well as phone calls while costing far less. The Imperial College London study at a London eye clinic found non-attendance 38% lower among patients who got a text.

Two things turn a reminder from a notification into a fix. First, it has to be automated: manual reminder rounds are the first job to slip on a busy day. Second, the reply has to do something. A reminder that says "reply YES to confirm or RESCHEDULE to pick a new time" turns the patient who was going to DNA into a patient who tells you, in time to refill the slot.

2. Send the first reminder early enough to rearrange

A two-step sequence works for most private clinics: the first reminder two or three days before, so a patient whose plans have changed can move the appointment, and the second the day before or the morning of the visit for the patient who simply forgot. A review of 18 studies found no significant difference between reminders sent 24, 48 or 72 hours ahead, so the exact hour matters less than sending one at all and leaving time to reschedule.

For appointments booked more than a month out, add a third reminder a week ahead. Long lead times are where DNAs cluster.

3. Use the channel the patient actually reads

Ask at booking and store the answer on the patient record. Many patients read every SMS; a growing share live on WhatsApp; some want email for anything medical. A reminder on the wrong channel is a reminder that was never seen, and your reports will show it as sent. Check delivery status, not just sent status, and fall back from WhatsApp to SMS to email automatically.

4. Let patients rebook themselves

NHS England's guidance on reducing DNAs in outpatient services makes the point for everyone: give patients a way to cancel or change their appointment themselves, through a portal or two-way messaging. In a private clinic that means a reschedule link in the reminder and a booking system that lets patients pick a new slot within the rules you set, at 9pm on a Sunday if that is when they realise they can't come. A late reschedule is a filled slot; a DNA is not.

5. Take deposits for the appointment types that need them

Deposits make a booking real, and they work best where they are expected: aesthetics treatments, long physiotherapy initial assessments, private GP appointments booked weeks ahead. Set deposit rules per appointment type rather than across the board, show the rule before the patient confirms, and keep the exit easy: a deposit with a one-tap reschedule inside the notice period is fair; a deposit with no way to move the appointment just moves the complaint.

6. State what a missed slot costs, in the reminder

In a randomised trial across NHS hospital clinics, adding the specific cost of a missed appointment to the reminder text cut the DNA rate from 11.1% to 8.4%, with no charge and no penalty. A short, factual line, "a missed appointment costs the clinic the time another patient could have used", does more than a threat. Pair it with the reschedule link.

7. Keep a waitlist and fill the gaps

Even with everything above, some slots will free up late. Keep a short waitlist of patients who want to be seen sooner, note their availability, and offer a freed slot to several of them at once on a first-reply basis. A waitlist turns a late cancellation into a seen patient, which is the whole point of separating cancellations from DNAs in your numbers.

8. Track it monthly and fix the pattern, not the average

Report the DNA rate by clinician, site, appointment type and weekday every month. Then act on the pattern:

• Long-lead bookings DNA more? Add the week-ahead reminder for that appointment type.
• The same patients? A personal message before the next visit, asking whether something is getting in the way, works better than a charge.
• One session always struggles? Keep waitlist patients on standby for it, or move that appointment type to a time patients keep.
• One site runs higher than the others? Check the reminder rule and the channel mix for that site before anything else.

Small, specific changes applied consistently are what bring a DNA rate from 11% towards 6% and keep it there.

Putting it together in one system

None of these steps is difficult on its own. The hard part is doing all eight every week while reception juggles the phones, the diary and three inboxes. That is the case for running reminders, rebooking, deposits, the waitlist and the reporting from one place, so the reminder goes out on its own, the reply updates the diary, and the DNA report is a tab rather than a spreadsheet.

Capra does that for private clinics: timezone-aware SMS, WhatsApp and email reminders with one-tap confirm and reschedule, self-service rebooking within your rules, deposits per appointment type, a waitlist that fills freed slots, and a DNA report by clinician, site and appointment type. If you want to see what your current rate is costing, the no-show calculator takes three numbers from last month, and a demo will show how the sequence above looks for your clinic.