The verdict in three sentences
A missed appointment is a billable slot lost that nobody replaces, and it affects 20 to 35 % of appointments in a typical clinic. A simple SMS reminder at D-1 + H-3 with one-tap confirm or cancel brings no-shows down to 8-12 % and frees seats for the waiting list. At 15-25 FCFA per SMS, the investment pays off from roughly thirty appointments a week.
The real cost of a missed appointment
A no-show is not neutral: the clinician is paid or idle, the equipment is ready, and the slot cannot be resold at the last minute. In a specialty clinic, a slot is worth between 10,000 and 25,000 FCFA. Multiplied by dozens of monthly absences, the loss becomes a genuine budget line.
| Metric (2026, ballpark) | No reminder | With SMS reminder D-1 + H-3 |
|---|---|---|
| No-show rate | 20-35 % | 8-12 % |
| Lost slots / week (on 120 appts) | 24-42 | 10-14 |
| Value lost / week | 240,000-1,050,000 FCFA | 100,000-350,000 FCFA |
| Patient confirmation rate | — | 55-70 % |
| Slots rebooked via early cancellation | Rare | 3-6 / week |
SMS, WhatsApp or manual call: what to choose
A manual call works but costs front-desk time. SMS is universal (no smartphone needed, works on 2G). WhatsApp adds interactive buttons but assumes a smartphone and a data connection.
| Channel | Unit cost | Open rate | 1-tap confirm | Best for |
|---|---|---|---|---|
| SMS | 15-25 FCFA | 90-98 % | Yes (reply YES/NO) | All patients, 2G areas |
| 8-20 FCFA (session) | 75-85 % | Yes (buttons) | Connected urban patients | |
| Manual call | 150-400 FCFA (time) | Variable | No | VIP patients, major procedures |
| ~0 FCFA | 20-35 % | Low | Secondary reminder |
The winning setup in Nairobi: SMS by default, WhatsApp as a complement for patients who opted in, and manual calls reserved for major procedures.
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Mini case study
Dr. Kariuki runs a 4-clinician practice in Nairobi: 120 appointments a week, no-show at 28 %, i.e. about 34 lost slots at 15,000 FCFA on average = 510,000 FCFA lost per week. After rolling out SMS reminders at D-1 + H-3, no-shows fall to 11 % (13 lost slots). Weekly gain: 21 recovered slots × 15,000 = 315,000 FCFA. SMS cost: 120 appts × 2 reminders × 20 FCFA = 4,800 FCFA per week. The return is immediate, from the very first week.
FAQ
How many reminders should you send, and when? Two are enough: one at D-1 (the day before) to leave time to cancel, and one at H-3 (three hours before) to prevent same-day forgetting. Beyond that, patients feel harassed and confirmation plateaus around 55-70 %.
Can the patient cancel or reschedule directly? Yes: they reply YES to confirm or NO to cancel, which automatically frees the slot. This early rescheduling typically recovers 3 to 6 slots per week for the waiting list.
What monthly SMS budget should I plan for? For 120 appts/week with 2 reminders, expect about 19,200 FCFA of SMS per month — negligible against the hundreds of thousands of FCFA in recovered slots.
Is it compliant with medical confidentiality? The message stays minimal (date, time, clinic name) and never mentions the reason or diagnosis. The patient consents to reminders when booking.
Do I have to replace the clinic's whole software? No. The reminder module connects to your existing calendar or runs as a lightweight standalone app, without replacing your current system.
Let's talk about your project. We set up your automatic SMS and WhatsApp reminders, connected to your calendar, within days. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
