Operational Framework

Clinical Trial Enrollment Workflow Template

A visual framework for managing candidate movement from referral through randomization while reducing delays, bottlenecks, and enrollment leakage.

This template is an operational documentation aid. It does not determine eligibility, replace protocol interpretation, substitute for informed consent, or prescribe the order of site-controlled clinical activities.

End-to-End Workflow

The Enrollment Pathway

Referral
Clinical Trial Intake
Prescreening
Site Handoff
Coordinator Review
Screening Visit
Consent
Randomization

Section 1

The Enrollment Workflow Explained

Each stage in the enrollment pathway has a defined purpose, primary owner, and specific failure points that produce downstream performance problems when left unaddressed.

The research site conducts informed consent, formal protocol screening, final eligibility review, and randomization in the order required by the protocol, IRB or IEC approvals, and applicable requirements. Where separate consent and screening rows appear below, the displayed order does not prescribe a universal sequence.

Referral

Purpose

Capture potential candidates from outreach, advertising, physician referrals, or database sourcing and route them into the enrollment pipeline.

Primary Owner

Referral source or outreach process

Common Failure Points

  • Lost referrals due to absent tracking
  • Incomplete contact or preliminary information
  • Delayed or absent first-response to incoming referrals
Operational Risk: Referrals that are not captured, assigned, and routed promptly can be lost from the workflow. Sites should define a study-appropriate response target and track early-stage disposition rather than relying on a universal time threshold.

Clinical Trial Intake

Purpose

Collect, standardize, and document all candidate information required to initiate prescreening. Establish first contact and document preliminary candidate-reported information.

Primary Owner

Intake team

Common Failure Points

  • Incomplete referral records that stall prescreening initiation
  • Missing contact attempts that allow candidates to disengage
  • Poor documentation quality that forces re-contact cycles
Operational Risk: Intake failure extends the referral-to-prescreening interval and forces re-contact that introduces a second dropout opportunity. Each additional contact round reduces the likelihood of candidate progression.

Prescreening

Purpose

Document candidate-reported responses to site-approved preliminary questions and organize the record for authorized site review. May help support coordinator capacity by preparing organized records.

Primary Owner

Prescreening team

Common Failure Points

  • Records advanced to site review with incomplete or unresolved information
  • Site-approved question set missing key items
  • Unfiltered referrals creating unnecessary coordinator burden
Operational Risk: Disorganized prescreening can contribute to elevated screen failure rates when records arrive at site review with incomplete information. Each screen failure consumes clinical coordinator time, site resources, and candidate goodwill.

Site Handoff

Purpose

Transfer documentation-complete candidate records from the enrollment operations function to the clinical coordinator team for scheduling and site review.

Primary Owner

Enrollment operations

Common Failure Points

  • Communication breakdowns between prescreening and site teams
  • Delayed handoff that extends the time between prescreening completion and screening visit
  • Missing information that requires coordinators to reconstruct candidate data
Operational Risk: Every day between prescreening completion and screening visit scheduling is a period of active dropout risk. Candidates whose records are prepared for site review but have not been scheduled may disengage or find alternative options.

Coordinator Review

Purpose

Prepare the candidate for the screening visit by confirming documentation completeness, completing required documentation, and scheduling the visit.

Primary Owner

Clinical Research Coordinator

Common Failure Points

  • Capacity constraints from unfiltered referral workload
  • Scheduling delays due to coordinator availability conflicts
  • Documentation issues from incomplete handoff packages
Operational Risk: Coordinator capacity is a finite resource. When coordinators are managing intake and prescreening work alongside clinical responsibilities, the review stage slows and candidates experience delays that increase dropout risk.

Screening Visit

Purpose

Conduct formal protocol screening according to protocol requirements (site-controlled).

Primary Owner

Site team

Common Failure Points

  • Screen failures from candidates not meeting protocol criteria
  • Missing medical records or laboratory results that delay the visit
  • Visit scheduling delays that extend the site review timeline
Operational Risk: Screen failures at this stage represent the highest per-candidate resource cost in the pathway. Coordinating, staffing, and conducting a screening visit for a candidate who does not meet protocol criteria is a significant operational cost.

Consent

Purpose

Complete the informed consent process (site-controlled).

Primary Owner

Site investigator and coordinator

Common Failure Points

  • Participant withdrawal after consent but before randomization
  • Communication gaps about study requirements that produce unexpected withdrawals
  • Scheduling delays between site review and the consent conversation
Operational Risk: Post-consent withdrawal before randomization may reflect gaps in how study requirements were communicated. This can occur at any point in the pathway and should be reviewed alongside local site data.

Randomization

Purpose

Complete study enrollment and formally enter the participant into the trial.

Primary Owner

Site research team

Common Failure Points

  • Operational delays that push beyond randomization window
  • Missed randomization windows due to administrative errors
  • Documentation gaps that delay randomization authorization
Operational Risk: Participants who have consented but are not randomized within the protocol window may require re-screening or no longer meet protocol criteria per site determination. This represents the maximum per-candidate investment loss in the enrollment pathway.

Section 2

Common Enrollment Leakage Points

Enrollment leakage occurs when candidates who could have enrolled exit the pipeline due to operational failures rather than clinical ineligibility. Each leakage point has a defined cause, measurable impact, and operational correction. For a comparative look at how sites that manage these leakage points well differ from those that don't, see how high-performing research sites manage enrollment operations.

Referral → Intake Leakage

Problem

Referrals are generated but not captured, tracked, or responded to within the first-contact SLA.

Impact

Candidates disengage before the intake process begins. High-volume referral sources with fast response expectations drop the site from their referral list.

Suggested Improvement

Implement a defined intake response SLA and track first-contact compliance weekly. Any referral not contacted within 48 hours should trigger an escalation protocol.

Intake → Prescreening Leakage

Problem

Intake records are incomplete, contact is not confirmed, or prescreening initiation is delayed due to queue management failures.

Impact

Candidates who completed initial contact but did not receive a prescreening conversation drop out without being assessed for eligibility.

Suggested Improvement

Define minimum documentation completeness standards for advancement from intake to prescreening. Implement a structured follow-up protocol for non-responding candidates.

Prescreening → Site Handoff Leakage

Problem

Candidates whose records are prepared for site review are not handed off to the site within the defined time standard, or handoff packages are incomplete.

Impact

Each day between prescreening completion and handoff delivery is active dropout risk. Candidates whose records were prepared for site review but were not scheduled promptly may disengage.

Suggested Improvement

Define a maximum handoff delivery time after prescreening completion. Standardize the handoff package content and enforce completeness as a gate condition for site referral.

Coordinator Capacity Leakage

Problem

Coordinators are managing intake and prescreening work alongside clinical responsibilities, reducing their available time for scheduling and clinical preparation.

Impact

Slower scheduling, more documentation errors, longer time-to-screen, and elevated burnout risk that threatens coordinator retention.

Suggested Improvement

Separate intake and prescreening responsibilities from the coordinator function through dedicated enrollment support. Coordinators should receive documentation-complete referrals.

Screen Failure Leakage

Problem

Candidates whose records are prepared for site review may still not meet protocol criteria at formal screening, which is a site-controlled determination.

Impact

Screen failures consume the highest per-candidate resource cost in the pathway and inflate the site's screen failure rate, which negatively affects sponsor evaluation of site performance.

Suggested Improvement

Review site screen failure records with the site to identify common patterns. Update the site-approved question set accordingly.

Consent Withdrawal Leakage

Problem

Participants withdraw after consent because study requirements were not adequately explained before the consent conversation.

Impact

Post-consent withdrawal before randomization is the most expensive candidate loss event. It consumes the full resource cost of all prior enrollment stages without producing an enrollment outcome.

Suggested Improvement

Incorporate site-approved study information review into the prescreening conversation. Document that visit schedule and time-commitment information approved by the site was provided. Escalate questions about risks, benefits, procedures, protocol requirements, eligibility, or consent to authorized research-site personnel.

Randomization Delay Leakage

Problem

Participants who have consented are not randomized within the protocol window due to administrative or scheduling failures.

Impact

Expired randomization windows require re-screening or produce permanent ineligibility for enrolled participants, wasting the entire upstream investment.

Suggested Improvement

Define a maximum interval between consent and randomization and track adherence. Assign clear ownership of the randomization scheduling process with defined escalation criteria.

Section 3

Enrollment Workflow Optimization Checklist

Use this checklist to evaluate which enrollment workflow elements are currently in place at your site and identify the gaps with the highest improvement priority.

Referral tracking process

All incoming referrals are captured in a centralized tracking system with date, source, and status recorded.

Intake workflow documented

Written SOP defines data collection requirements, response time standards, and queue management procedures.

Prescreening process standardized

Site-approved preliminary question set is in place and applied consistently to every candidate.

Coordinator workload monitored

Active referral counts and non-clinical enrollment time are tracked as regular operational metrics.

Screen failures reviewed

Site screen failure records are reviewed monthly with the site to identify common patterns.

Conversion metrics tracked

Stage-specific conversion rates are calculated and reviewed for intake, prescreening, and site handoff stages.

Randomization timelines measured

Time from consent to randomization is tracked and reviewed against protocol window requirements.

Enrollment bottlenecks identified

A formal bottleneck review process exists and produces documented improvement actions.

Section 4

Related Operational Frameworks

Each stage in the enrollment workflow has a dedicated operational framework that provides deeper guidance on process design, performance measurement, and improvement. For the specific operational characteristics that allow high-performing sites to execute this workflow consistently, see how high-performing research sites manage enrollment operations. For the conversion improvements available within this workflow without adding referral volume, see improving enrollment performance without increasing referrals.

Enrollment OperationsThe operational framework governing how enrollment activities are organized and managed.View Framework →
Clinical Trial IntakeStructuring the first step in the enrollment workflow to capture and organize referrals.View Framework →
Clinical Trial PrescreeningOrganizing candidate-reported information before formal site review to support coordinator capacity.View Framework →
Coordinator CapacityProtecting CRC resources so coordinators can focus on clinical responsibilities.View Framework →
Referral to RandomizationClosing the gap between candidate interest and study enrollment.View Framework →
Enrollment InfrastructureThe systems and workflows that sustain consistent clinical trial participation.View Framework →

Section 5

Downloadable Workflow Summary

Clinical Trial Enrollment Workflow Summary

A simplified operational workflow that research sites can use to evaluate candidate movement, identify bottlenecks, and support enrollment operations.

This template is an operational documentation aid. It does not determine eligibility, replace protocol interpretation, substitute for informed consent, or prescribe the order of site-controlled clinical activities.

01Referral
02Clinical Trial Intake
03Prescreening
04Site Handoff
05Coordinator Review
06Screening Visit
07Consent
08Randomization

If any stage in your enrollment workflow has gaps, a structured operational review can help identify the specific failure points and the process changes that may support enrollment operations.

Need Help With Enrollment Operations?

Explore Enrollment Operations Consulting