Fertility clinic ads: why the enquiry isn't the conversion (long cycles, late signals)

Fertility marketing runs on a very long timeline. Someone can consider a clinic for months. They enquire, they come for a consultation, they think again, and maybe they start treatment. And every step of that is a decision made under a lot of emotion.

So the form fill, which is all the ad platform ever sees, is nowhere near the moment that matters. A long consideration cycle closes in the clinic, so the ad platform needs the later stage, not the enquiry. That's the core problem, and it comes with two practical complications.

Complication one: the time gap. Let me lay out the windows, because they decide what you can send. Google Ads accepts an offline conversion up to 90 days after the click. LinkedIn accepts conversions up to 90 days old. Meta rejects events sent more than 7 days after they happened. So if the cycle is long, you need to send an earlier stage while the click is still in range, like a booked consultation, and you need to send it promptly.

A made-up timeline to show the point. Click on day 0. Enquiry on day 0. Consultation booked on day 12. Consultation attended on day 20. Treatment begins on day 140. The treatment stage is far outside every window. The booked and attended stages are comfortably inside. So those are the ones the ads can learn from, and they're good signals: a person who attended a fertility consultation is a serious prospect.

Complication two: sensitivity. Fertility is deeply personal, and it's exactly the kind of thing that shouldn't be readable from a page link or an event name. A URL like /ivf-consultation/book says a lot. So the same events that carry the signal need neutral names and clean links.

A sensible pattern: send the consultation booked and the consultation attended as separate events, neutrally named, matched by hashed identity. Watch the cost per attended consultation, not cost per enquiry. And accept that the final treatment stage may never come back to the ads, and that's fine. You aren't trying to attribute everything, only to give the campaign good enough evidence to find more people like the ones who attend.

Something else worth doing: record the date of each stage in the CRM. If you can see how long each patient took to move from enquiry to consultation, you learn how much time your campaigns need before they can be judged, and you avoid stopping a campaign that hasn't had time to produce results.

Because long cycles make campaigns hard to judge, here's an evaluation schedule I'd suggest for a fertility or similar high-consideration service.

Week 2: check that events are flowing. Are enquiries and bookings reaching the ad platform? Is match quality steady? Don't judge results yet.

Week 6: look at attended consultations per campaign. This is the first real signal, and it's early enough to act on.

Week 12: look at cost per attended consultation over a full cohort. By now enough people have moved through the funnel to compare campaigns fairly.

Beyond that: watch how long the average patient takes from enquiry to consultation, and use it to set how long you wait before judging a campaign.

The mistake to avoid is turning off a campaign at week two because it has no treatments to show. Given the timeline, it couldn't have any yet.

If you work in this space: which stage do you treat as the "real" conversion?