How to improve patient recruitment for your clinical trial
By Bryan Manning, Founder · Updated August 2026
Direct answer: Most enrollment problems aren’t awareness problems, they’re follow-through problems. The highest-impact fixes, in order: call every referral back in minutes instead of days, put one accountable owner on the patient’s path from first click to site visit, pre-qualify twice before the site ever sees the patient, fix the sites that are quietly producing zero, and only then spend more on advertising. Nearly 85% of interventional trials miss their enrollment milestones, and almost none of them miss because too few people saw an ad.
Start with the leak, not the faucet
When a trial is behind, the reflex is to buy more top-of-funnel: more ads, another vendor, a bigger registry. But walk the funnel of a struggling trial and you’ll usually find the same pattern. Plenty of interested patients. Then a form submission that nobody called for four days. A screener call that went to voicemail twice. A site coordinator with 40 open referrals and no time. The patients existed. The follow-through didn’t.
So before spending another dollar on reach, measure three numbers:
- Median time from patient sign-up to first human contact. If it’s over 24 hours, that’s your biggest problem. Interest decays by the hour.
- Referral-to-screen rate by site. Sites vary wildly; averages hide the sites converting nothing.
- Screen-fail rate and the top three fail reasons. If patients are failing on criteria a two-minute pre-screen could catch, you’re burning site capacity and patient goodwill.
The seven fixes, ranked by impact
1. Speed to first contact
Call referrals back the same day. Better, the same minute. Our average from form submission to first phone call is 87 seconds, and that one operational choice does more for enrollment than any ad budget increase we’ve seen. It’s most of the reason we connect with 54% of patients across all therapeutic areas, and as high as 71% in some programs. Ask any vendor: who calls the patient, and how fast?
2. One owner for the whole patient path
Recruitment fails in the handoffs: vendor to sponsor to site to coordinator. Someone must own the patient’s experience from web visit to screener call to on-site visit. In our programs a named recruitment specialist follows each patient the entire way, and our site relations team speaks with each patient 3.7 times on average before they ever walk into a site. It’s the single structural change behind our 4.4x speed numbers.
3. Double-screen before the site sees anyone
A web pre-screener plus a live phone screen against the actual inclusion/exclusion criteria. Sites are the scarcest resource in any trial; sending them unqualified referrals wastes the exact capacity you need. In our programs the web screener removes about 60% of applicants and the phone screen removes another 77% of those remaining. Sites see only the survivors, which is why 89% of the patients we send on-site go on to sign the consent form, and why our programs cut screen fails by 18%.
4. Fix or bypass zero-producing sites
Rank sites by referral-to-enrollment conversion. For the bottom tier, find out why: no coordinator bandwidth, no parking, wrong clinic hours, referrals going to a shared inbox. Fix what’s fixable, and route patients toward sites that convert.
5. Make the patient’s story the creative
Patients don’t respond to protocol language; they respond to someone like them describing life with the condition. Authentic, emotional, informative story-first creative outperforms clinical copy in every therapeutic area we’ve worked in.
6. Reduce the burden you’re asking patients to carry
Travel support, flexible scheduling, telehealth where the protocol allows, and plain-language explanations of what participation actually involves. Published patient-perspective research says the same thing patients tell our screeners: logistics and communication decide whether interested people become enrolled people.
7. Then, and only then, buy more reach
Once follow-through is fixed, paid social is a genuinely powerful patient-finding engine, especially for conditions where patients congregate online. Sophisticated ad buying is a core part of how we find candidates. It’s step seven anyway, because reach poured into a leaky funnel is just a bigger leak.
What “good” looks like
- First contact in minutes (our average is 87 seconds), not days
- Referral-to-screen above 50% for pre-qualified referrals
- Screen fails trending down month over month
- Every site either producing or on a fix plan
- Weekly enrollment forecast that management actually believes
Frequently asked questions
How long should patient recruitment take?
Plan against your protocol’s enrollment window, but know the base rate: most trials miss it, and rescue mid-trial costs far more than starting with accountability in place. Our sponsor programs finish enrollment 57 days ahead of plan on average.
What’s the biggest recruitment mistake sponsors make?
Paying for referrals and assuming enrollments will follow. The gap between a referral and a randomized patient is where trials die, and most contracts leave that gap unowned.
Does social media advertising work for clinical trials?
Yes, when it’s paired with fast human follow-up and real pre-qualification. Ads alone generate interest; interest without follow-through generates nothing.
When should we bring in a recruitment company?
Ideally before first patient in, when enrollment risk is priced into the plan. Realistically, the moment your enrollment curve falls below plan for a second consecutive month. The earlier a specialist takes ownership, the cheaper the fix.
Enrollment on the line?
Most firms recruit patients. We deliver enrollments. We take ownership of the whole path, from first click to site visit, and we only get paid when patients enroll.