"Recruitment is behind" is a symptom, not a diagnosis. A study can miss its enrollment target because too few patients are being referred, because too many fail screening, or because eligible patients are dropping out between consent and randomization. Each problem has a different fix, and treating them as one issue usually means fixing the wrong thing first.
Track the funnel, not just the total
Total enrollment is a lagging indicator. By the time it's visibly behind schedule, the study has often been leaking patients at a specific stage for weeks. Breaking the funnel into referred, pre-screened, screened, screen-failed, consented, and randomized makes the leak visible early, usually a full monitoring cycle before the topline number would have flagged it.
Screen-failure rate as an early warning
A screen-failure rate that climbs site over site, month over month, is one of the earliest and most reliable warning signs of a protocol eligibility criteria problem or a site that isn't pre-screening carefully before formal screening visits. Catching that trend at week six instead of week sixteen is the difference between a protocol amendment and a missed database lock.
Site-by-site comparison beats a single aggregate number
Aggregate funnel metrics hide the sites that are actually struggling. The same funnel broken out by site usually shows that two or three sites account for most of the shortfall, which tells you exactly where to focus retraining, additional outreach support, or a site-specific corrective action, rather than a blanket message to the whole network.
Make it a five-minute weekly habit
The teams that catch recruitment problems early aren't running more sophisticated statistics, they're just looking at the funnel every week instead of every month. Our Patient Recruitment & Screening Funnel Tracker is built for exactly that weekly habit: enter referrals and outcomes by site, and the stage-by-stage conversion and screen-failure trends calculate automatically.