Operational Framework

Clinical Trial Enrollment Workflow Template

A visual framework for mapping candidate movement from referral through randomization and reviewing where ownership, documentation, handoffs, or timing may deserve attention.

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 distinct purpose, primary owner, and common points where process variation, missing information, or unclear ownership may affect the next step.

The research site conducts informed consent, formal protocol screening, final eligibility review, and randomization in the order required by the protocol, institutional review board (IRB) or independent ethics committee (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: Incomplete intake can extend the referral-to-prescreening interval and may require additional contact before the next step is clear. Sites can track re-contact and elapsed time against their own workflow expectations rather than assuming a universal effect on 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 preliminary prescreening can create additional site-review work when records arrive with incomplete or unresolved information. Formal screening outcomes remain site-controlled and can reflect many protocol-, candidate-, and study-specific factors.

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: Longer intervals between handoff preparation and site scheduling leave more time for candidate circumstances or availability to change. Sites may choose to track this interval against study-specific expectations without treating elapsed time as proof of disengagement.

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 time is finite. When intake, preliminary prescreening, and clinical responsibilities draw on the same team, sites may want to review whether workload changes are affecting review, scheduling, or documentation timing.

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: Formal screening uses site resources and may result in a screen failure for protocol-, candidate-, or study-specific reasons. Sites can review screening outcomes and local resource use without assuming that an upstream operational change would have prevented the result.

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 can have many causes. Sites should review local data and the circumstances of each case rather than assuming that communication or another operational factor was responsible.

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 an applicable protocol window may require additional site review or re-screening, depending on the protocol and site determination. The operational and financial implications should be evaluated using study-specific information.

Section 2

Common Enrollment Leakage Points

This section offers an operational way to review where candidates or records may stop progressing through a workflow. The examples are illustrative: they do not establish why a particular candidate stopped progressing, prove that a specific process caused the outcome, or guarantee that one workflow change will improve conversion. For a comparative look at different enrollment-operations approaches, 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 site’s locally defined first-contact target.

Impact

Delayed first response can leave candidates without a clear next step and should be reviewed against the site’s study-specific workflow and referral-source expectations.

Suggested Improvement

Define a study-appropriate intake response target, track first-contact compliance on a useful cadence, and create a local escalation rule for referrals that exceed that target.

Intake → Prescreening Leakage

Problem

Intake records may be incomplete, contact may remain unconfirmed, or preliminary prescreening may not begin when expected.

Impact

These conditions can leave the record without a clear next operational step and may require additional follow-up before authorized site review.

Suggested Improvement

Consider defining minimum documentation requirements for advancement and a site-approved follow-up approach for candidates who have not responded.

Prescreening → Site Handoff Leakage

Problem

Records prepared for site review may not be handed off within the site’s expected timeframe, or the handoff may still contain unresolved information.

Impact

Longer handoff intervals or incomplete information can make ownership and the next operational action less clear and may require additional coordination.

Suggested Improvement

Consider defining a study-appropriate handoff target, a consistent handoff structure, and clear rules for how unresolved items are documented before site review.

Coordinator Capacity Leakage

Problem

Intake, preliminary prescreening, scheduling, and clinical responsibilities may draw on the same coordinator capacity.

Impact

When multiple activities compete for the same time, sites may see changes in queue depth, response timing, scheduling, or documentation that are worth measuring against a local baseline.

Suggested Improvement

Review role ownership and decide which activities should remain with coordinators and which, if any, are better assigned to a dedicated support function within the approved workflow.

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 use site resources and may reflect protocol-, population-, documentation-, candidate-, or other study-specific factors. Their meaning should be interpreted from local site data.

Suggested Improvement

Review site-controlled screen-failure records for recurring patterns and determine whether any site-approved preliminary questions, documentation, or workflow steps merit revision.

Consent Withdrawal Leakage

Problem

A participant may withdraw after informed consent and before randomization for reasons that vary by study and individual circumstances.

Impact

The site may choose to review these events alongside local timing, communication, scheduling, and protocol information without assuming one operational cause.

Suggested Improvement

Where permitted, make approved logistical information available before handoff and escalate questions about risks, benefits, procedures, protocol requirements, eligibility, or consent to authorized research-site personnel.

Randomization Delay Leakage

Problem

A participant may not reach randomization within an applicable protocol window, depending on study-specific timing and site-controlled requirements.

Impact

Depending on the protocol and site determination, additional review, re-screening, rescheduling, or another disposition may be required.

Suggested Improvement

Where useful, track the applicable interval, clarify ownership of site-controlled scheduling activities, and define escalation rules consistent with the protocol and approved workflow.

Section 3

Enrollment Workflow Optimization Checklist

Use this checklist to review which enrollment workflow elements are currently in place at your site and which areas may deserve closer discussion or definition.

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 coordinator capacity 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 map candidate movement, review ownership and handoffs, and support enrollment-operations discussions.

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 you want to compare your current workflow with this template, a structured operational review can help clarify where ownership, documentation, handoff rules, or timing may deserve closer attention.

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