Why cheap leads are usually expensive
An instant form pre-fills the name and number, so tapping costs the user nothing and means nothing. Clinics routinely collect dozens of these, call them a day later, and reach voicemail — because the person had a passing interest at 11pm and no memory of it by morning.
The metric that exposes this is attendance. Divide total spend by patients who actually sat in the chair, and the cheap channel often turns out to be two or three times the price of the expensive one.
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Why WhatsApp converts here
Tapping into a chat is a small commitment, and once the conversation exists you can qualify, quote a band and offer two times before the intent cools. The patient also gets an immediate response, which no form does.
It only works if someone answers. A WhatsApp campaign pointed at an inbox that is checked twice a day performs worse than a form, because you have paid a premium for immediacy and then not delivered it.
When to use each
WhatsApp for considered procedures where the patient has questions — most aesthetics, dentistry, elective surgery. Call ads for urgent and symptom-driven work where someone wants an appointment today. Forms for after-hours capture, detailed intake, or campaigns aimed at patients who prefer not to message.
Whichever you run, tag the source so it arrives labelled. "Where did this come from" is a question your reception should never have to guess at.