Should a recruitment company or our CRO handle patient recruitment?
By Bryan Manning, Founder · Updated August 2026
Direct answer: If enrollment is a routine risk on your trial, your CRO’s plan is probably fine. If enrollment is THE risk (tight criteria, competitive landscape, a timeline with no slack), you want a specialist whose entire fee depends on enrollment numbers, because your CRO’s doesn’t. CROs are trial managers. Recruitment inside most CROs is a subcontracted line item, and line items don’t stay up at night about your enrollment curve.
What CROs are actually built for
A good CRO runs your trial: sites, monitoring, data, regulatory, logistics. That’s an enormous job and they’re built for it. Recruitment sits inside that machine as one workstream among forty, usually executed through site expectations (“sites will identify patients from their databases”) plus a media subcontractor if things slip. Nobody at the CRO loses money when enrollment runs late. Often, billed hours run longer.
The incentive gap, in one question
Ask your CRO what happens to their fees if enrollment finishes three months late. Then ask a success-based recruitment company the same question. Our answer: we don’t get paid until patients enroll, so a late trial costs us directly. Nearly 85% of interventional trials miss their enrollment milestones, yet RFP responses overpromise enrollment timelines by 47% on average. Somebody carries that gap, and under most contracts it’s the sponsor, alone.
When your CRO is enough
Be honest in the other direction too. If your criteria are broad, your sites have deep patient databases in the indication, the competitive landscape is quiet, and your timeline has slack, a dedicated recruitment vendor may be an unnecessary layer. Common conditions with motivated sites can and do enroll on site effort alone.
When a specialist earns the added vendor
- Criteria are tight and the eligible population is a sliver
- Multiple competing trials are recruiting the same patients
- The enrollment window has no slack, or the trial is already behind
- Site databases are shallow in this indication
- You’ve been burned before by referral volume that never converted
In those trials, the question isn’t whether you can afford a recruitment specialist. It’s whether you can afford the months a miss costs. Our sponsor programs have averaged $19.2M in savings and finished enrollment 57 days ahead of plan.
How the two work together
This isn’t either/or. The best setup we see: the CRO runs the trial, the recruitment company owns the patient pipeline into it, and the two share site-level data weekly. Good CROs welcome it, because enrollment misses land on their client relationship too. If your CRO resists an accountable recruitment partner, ask why.
Frequently asked questions
Won’t adding a vendor create coordination overhead?
Some, and it’s worth pricing. A weekly funnel review and a shared referral tracker cover most of it. Compare that overhead to a quarter of enrollment delay and the math resolves fast.
Our CRO offers recruitment services. Aren’t those the same thing?
Ask two questions: is the team dedicated or pulled from project management, and is any fee at risk against enrollment numbers? Recruitment with nothing at stake is marketing spend with a clinical letterhead.
When in the trial should we decide this?
Before first patient in, ideally, when the enrollment risk can be priced into the plan. The realistic trigger: your enrollment curve falls below plan for a second consecutive month.
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.