The framing that helps
Three different people miss an appointment for three different reasons. One forgot. One knew for a fortnight that they could not come and never told you. One had something come up that morning.
A single reminder can only catch one of those, and almost every practice sends the one that catches the forgetful — twenty-four hours out. That is the right message to send if you can only send one. It is also why practices that send exactly one reminder see the rate fall and then stop falling.
The three touchpoints
In order of when they fire, with what each is for and what it should say.
- 1
Seven days out — aimed at the person who already knows
One line, the date and time, and an explicit invitation to move it. "If that no longer works, reply and we will find another slot."
This is the only reminder that can recover money rather than merely avoid loss, because seven days is long enough to resell the hour. It is also the most commonly skipped, because it feels premature and because vendors default to a 24-hour reminder.
- 2
Twenty-four hours out — aimed at forgetting
The workhorse. Date, time, address, and a way to confirm in one tap.
Afternoon beats morning in most practices' own data. A message arriving mid-morning joins a queue of work things; one arriving around four is read when the person is already thinking about tomorrow.
- 3
Two to three hours before — aimed at the morning-of clash
Short. Address, and a way to say no. Nothing else, and no guilt.
It will not fill the slot. What it does is turn a silent absence into a phone call, which matters more for staff planning than for revenue — and it converts a fraction of people who were wavering.
A fourth message does not add anything measurable and does subtract something unmeasurable. Past three, the reminders stop reading as service and start reading as nagging, and the patients most likely to feel that are the reliable ones you were not worried about.
What each touchpoint is actually for
Same programme, three jobs. Sending only one of these is a choice about which failure you accept.
| Timing | Prevents | Recovers the slot? | Skip it when |
|---|---|---|---|
| 7 days out | Silent ambivalence | Yes — enough time to resell | You book less than a week ahead anyway |
| 24 hours out | Forgetting | Rarely | Never. This is the one that matters most. |
| 2–3 hours out | Morning-of clashes | No | Your appointments are short and back-to-back, where it reads as fussy |
| A fourth message | Nothing new | No | Always |
For recurring patients you see monthly, drop the seven-day message. They know the pattern, and the extra touch is where a reminder programme starts to feel like a subscription they did not ask for.
Details that matter more than the count
Practices tune the number and ignore these, and these are where the difference actually is.
- The message must be repliableA no-reply number converts a reminder into an announcement. Half the value of the seven-day message is the reply, and a sender that cannot receive one throws that away.
- Name the clinician, not just the practice"Your appointment with Dr Okafor" outperforms "your appointment at Riverside Dental" for the same reason a personal ask outperforms a form letter: it implies somebody specific is expecting you.
- Include the address as text, not only a linkPeople screenshot reminders. A link in a screenshot is decoration.
- Send from a number the patient has seen beforeA rotating sender is treated as spam by both the phone and the person. Channel consistency beats message quality.
- Make cancelling easy and say soCounterintuitive and repeatedly borne out: practices that make cancellation frictionless get more cancellations and fewer no-shows, and the cancellations arrive early enough to be useful.
- Do not attach clinical detailThe reason for the visit is not something to put in a message that will be read on a lock screen, and in several jurisdictions it is not something you may put there at all.
None of the six are about wording. Every vendor demo is about wording.
Questions
Is three too many for a routine appointment?
What about the day of booking — an immediate confirmation?
Should reminders ask for confirmation or just inform?
Does the channel change the right number?
Tell me when this exists
In the context field: how many reminders you send now, and whether anyone replies to them.