A clinic can switch on online booking in an afternoon and still have three families turn up for the same 10:00 slot. At a paediatric clinic that might be a mother who booked online, a father who phoned on Saturday and was told "come at 10", and a regular family who never calls ahead. The booking software did its job. The clinic just never decided how online bookings, phone bookings and walk-ins were meant to share the same morning, and that decision is most of the setup work.
Most problems with an online appointment setup start this way, and five decisions, made before the link goes out, settle most of them.
Five decisions to write down first
1. Slot length for each visit type. A review of a child's fever doesn't take as long as a first developmental assessment. Set at least two lengths, say 10 minutes for follow-ups and 25 for new patients, so the calendar reflects how consultations really run.
2. How far ahead patients can book. A three-week window suits planned check-ups. A booking window of three months fills the calendar with appointments people forget they made. Start with two to three weeks and adjust from there.
3. A cutoff before each slot. If someone can book at 10:50 for an 11:00 slot, reception has no time to pull the file. Many clinics close online booking one to two hours before each slot.
4. Walk-in capacity. Most Indian clinics still see a steady stream of walk-ins. Decide what share of each session stays off the online calendar. It might be 30% in the morning and 10% on Saturday evenings. Then the scene above has a rule behind it and doesn't depend on whoever is at the front desk that morning.
5. Auto-confirm or manual approval. Auto-confirmation is quicker for patients. Manual approval lets the receptionist catch a patient booking an ENT slot for a dental problem. Clinics with one doctor usually auto-confirm. Specialty practices often don't.
Setting it up, in order
Enter your visit types and their durations.
Add weekly availability, including lunch, hospital rounds and the Thursday afternoon you spend in surgery.
Put the booking link on your website and your Google Business Profile. Google lets eligible businesses add an appointment link or connect a supported booking provider for a "Book" button. Whether the Bookings option appears depends on your business category and country.
Set up the confirmation and reminder messages (details below).
Book a test appointment yourself on a phone using mobile data, then cancel and reschedule it.
Walk reception through the two awkward cases: a patient who booked online but isn't showing on the desk's list, and a walk-in who wants a slot that's already taken online.
Reminders do most of the work
A 2026 study at an Indian tertiary hospital asked 100 patients who had missed outpatient appointments why they didn't come. Forgetfulness scored highest, and the lack of a reminder came second. Distance from the hospital made no significant difference. One detail matters here: the study didn't find reminders alone significantly linked to attendance, and the authors recommended better reminders together with easier rescheduling. Wider evidence is positive but modest. A 2013 Cochrane review found SMS reminders raised attendance by about 10% compared with no reminder.
In practice, that means:
Send the reminder close to the appointment, either the evening before or the same morning. A confirmation sent three weeks ahead won't help anyone remember.
Include a one-tap reschedule link. A parent whose child has an exam that day will move the slot if it's easy, and won't bother calling the clinic.
Ask patients to confirm. A "Reply 1 to confirm" message the day before shows you who hasn't replied, and reception can call them while the slot can still be given to someone else.
On the channel itself, SMS reminders in India have to go through TRAI's DLT system (the registration process for business SMS), with a registered sender header and approved message templates, so allow a few days for that paperwork. On WhatsApp, reminders go out as utility templates, which Meta has charged per message since July 2025.
Common mistakes
Most of the mistakes clinics make are the five decisions above left undecided. One slot length gets used for every kind of visit, or online bookings stay open right up to the minute. A confirmation goes out at the time of booking and nothing follows nearer the date. Some clinics keep online and walk-in bookings in two separate calendars, which guarantees double-booking.
The quieter mistake is never revisiting the settings. Check durations and availability every quarter, or sooner when a doctor joins or leaves or your hours change.
For the first month, keep a simple tally at reception of online bookings, no-shows among them, and walk-ins turned away. Four weeks of those numbers will tell you whether the walk-in share, the cutoff time or the reminder timing needs adjusting, and you won't have to rely on how busy the mornings felt.
Whichever system you pick, also decide who owns the calendar. In most clinics it should be one named person, often the senior receptionist, who can change the rules without waiting for the doctor to be free, and who reads that first month's tally.
Booking, queue and reminders in ExaHealth
In ExaHealth, patients book into the appointments calendar from the clinic's own booking page, so no directory takes a fee for the appointment. That page can sit on a clinic website on your own domain. Appointment and follow-up reminders are delivered on WhatsApp itself, with no separate app for patients. On the day, the live queue shows patients their real wait time and sends a "you're next" WhatsApp alert with an estimated wait, which helps when walk-ins push the morning back. WhatsApp volume is capped at 500 messages a month on Solo and uncapped on Clinic and Enterprise. None of this makes the five decisions for you: slot lengths, cutoffs and walk-in share are still the clinic's call.
To talk through how your own slot lengths and walk-in share would be set up, contact the ExaHealth team.
Two guides that pick up where this one stops: Live Queue Management for Clinics: Cutting Patient Wait Times, and Does Your Clinic Need Its Own Website? (Beyond a Directory Listing).
Sources
Yadav, Khaliq and Khan, IJCMPH (2026): reasons for missed outpatient appointments
Cochrane Review: mobile phone text reminders for healthcare appointments
American Family Physician: summary of the Cochrane review on text reminders
Google Business Profile Help: bookings and appointment links
TRAI: Telecom Commercial Communications Customer Preference Regulations, 2018
Frequently Asked Questions
How long does online appointment setup take?
Entering slots and connecting the booking link can often be done in one sitting. Settling on slot lengths, walk-in share and cancellation rules takes longer and matters more. If you use SMS, allow a few extra days for TRAI DLT template approval as well.
Do online bookings reduce no-shows by themselves?
Not really. Reminders make the difference. A 2013 Cochrane review found SMS reminders improved attendance by about 10%, and patients in a 2026 Indian hospital study rated forgetfulness and missing reminders as their main reasons for skipping appointments.
How do we handle walk-ins alongside online bookings?
Keep a fixed share of each session off the online calendar, and run both through a single calendar that reception can see. Then when two families arrive for the same time, the answer is already decided.
Can we pause online bookings on a busy day?
Most scheduling tools let you block specific dates or sessions for new online bookings while keeping existing appointments. Check this during the demo, since it's the setting you'll want quickly during an outbreak season or when a doctor is unexpectedly away.