Clinical trial protocol template, written to be built
A protocol is read by ethics committees, regulators, sites and the people who build your database. This template covers every section they expect, with notes on writing each one so it turns into clean eCRFs instead of amendments.
- Aligned with ICH, SPIRIT and M11 structure
- Schedule of activities first
- Upload it to draft your study
Free sandbox · No credit card · 21 CFR Part 11 aligned
- 1Complete
Protocol summary and synopsis
- 1.3Complete
Schedule of activities
8 visits, 14 assessments
- 3Complete
Objectives, endpoints and estimands
- 5Draft
Study population: eligibility criteria
12 inclusion, 15 exclusion
- 8Draft
Study assessments and procedures
- 9To do
Safety: AE and SAE reporting
- 10To do
Statistical considerations
Key points
- There is no single mandatory template, but content expectations are well defined: ICH E6 lists what a protocol should contain, the SPIRIT checklist (first published in 2013 and updated in 2025) sets reporting standards, and ICH's M11 work defines a harmonised, structured protocol template.
- For US Phase 2 and 3 studies under an IND or IDE, the NIH and FDA publish a free protocol template that many academic teams start from.
- Put the schedule of activities near the front. It is the most-used page of the protocol and the blueprint for the database and the budget.
- Align objectives, endpoints and estimands so each endpoint names what is measured, when, and how intercurrent events are handled.
- Write eligibility criteria and assessments so each one can become a single, checkable eCRF field. Ambiguity here becomes amendments later.
Template structure
Protocol template, section by section
Section numbering follows a common harmonised layout. Use your sponsor's template if it has one; the content expectations are the same.
| Section | What goes in it | Writing tip |
|---|---|---|
| 1. Protocol summary | Synopsis, study schema diagram and schedule of activities | The synopsis should stand alone; ethics reviewers often read only this. |
| 2. Introduction | Background, rationale and benefit-risk assessment | Cite the nonclinical and clinical data that justify the dose and population. |
| 3. Objectives and endpoints | Primary, secondary and exploratory objectives with matching endpoints and estimands | One endpoint per objective, with the time point and measurement named. |
| 4. Study design | Design, arms, blinding, duration, end of study definition | Say exactly when a participant's participation ends. |
| 5. Study population | Inclusion and exclusion criteria, lifestyle restrictions, screen failures | One testable condition per criterion, numbered. |
| 6. Study intervention | Dosing, preparation, randomisation, blinding, accountability, concomitant therapy | Define allowed and prohibited medications as lists. |
| 7. Discontinuation | Stopping treatment, withdrawal from the study, lost to follow-up | Distinguish stopping treatment from leaving the study. |
| 8. Assessments and procedures | Efficacy, safety, PK and other assessments; AE and SAE definitions and reporting | Describe how each assessment is done, not just when. |
| 9. Statistical considerations | Hypotheses, sample size, analysis populations, analyses, interim analyses | Match the analysis populations to the estimands in section 3. |
| 10. Supporting documentation | Regulatory and ethical considerations, consent, data protection, data management, monitoring, publication | Name the systems used for data capture and how data quality is assured. |
| 11. References and appendices | References, clinical laboratory tests, contraception guidance, abbreviations | Put lab test lists in an appendix so they can change without touching the body. |
Writing well
Write the protocol your database can follow
Every sentence in sections 1, 5 and 8 will eventually become a visit, a form or a field. Protocols written with that in mind produce studies that are faster to build, easier to monitor and need fewer amendments. Protocols written only for the ethics committee leave the data manager guessing, and those guesses show up as queries.
Make the schedule of activities the single source of truth
List every visit with its day and window, and every assessment as a row. If a procedure is described in section 8 but missing from the schedule (or the other way round), sites will not know which to follow. Keep windows explicit ("Day 28 ± 3 days"), because the database needs a number, not "approximately four weeks".
Tie each endpoint to data you will collect
For every endpoint, name the instrument or measurement, the visit and the derivation. "Change from baseline in PHQ-9 total score at Week 12" can be built directly; "improvement in mood" cannot. If an endpoint uses a validated instrument, confirm its licence early; see the instrument templates for scoring and licensing notes.
Write eligibility criteria that can be checked
Split compound criteria and give numeric thresholds with units. Each criterion should become one met or not-met question on the eligibility eCRF, with its supporting value recorded.
Plan for amendments
Most protocols are amended at least once, often to adjust eligibility or the schedule. Keep volatile detail (lab lists, contraception guidance) in appendices, and version every change. On the database side, choose a system where an amendment is a form update rather than a vendor project.
protocol_v3.pdf
- Synopsis
- Schedule of assessments
- Assessments
- Eligibility criteria
- PRO section
- Study drug
Draft study
- Study details
- Visits and windows
- CRF content
- Screening form
- Diaries
- Dispensing setup
From protocol to study
Upload the protocol. Get a draft study.
Capture's AI Study Generator reads a protocol in PDF, DOCX or DOC format and drafts the visit schedule, windows and forms. Nothing is saved without human review, and everything stays editable, so a well-structured protocol becomes a testable study in an afternoon instead of weeks of specification documents.
- Reads PDF, DOCX or DOC protocols.
- Drafts visits, windows and forms for review.
- Blank eCRF and blank ePRO PDFs for the ethics submission, generated from the approved forms.
Which standard?
Protocol templates and guidelines compared
| Source | What it is | Best for |
|---|---|---|
| ICH E6 (GCP) | Lists the content a protocol should include | Any interventional trial; the baseline expectation. |
| ICH M11 | Harmonised structured protocol template and electronic exchange specification | Sponsors wanting a common structure across regions and machine-readable protocols. |
| SPIRIT 2013 / 2025 | Checklist of items to address in a trial protocol | Academic trials and journals; checking completeness. |
| NIH-FDA Phase 2/3 template | Free template for trials under an IND or IDE | US investigator-initiated and academic trials. |
| Sponsor template | Company-specific layout | Industry-sponsored studies; follow it when one exists. |
See how your protocol becomes a study
Upload a draft protocol to a free sandbox and review the generated visits and forms.
Before submission
Protocol readiness checklist
Schedule of activities complete
Every assessment in section 8 appears in the schedule, with visit days and windows.
Endpoints measurable
Each endpoint names the measurement, time point and derivation.
Criteria testable
Numbered, one condition each, with thresholds and units.
Safety reporting defined
AE and SAE definitions, recording period, reporting timelines and responsibilities.
Sample size justified
Assumptions stated; see the sample size calculator.
Data management described
Systems, data flow, quality checks and retention, consistent with your data management plan.
What sections does a clinical trial protocol need?
Typically a summary with the schedule of activities, introduction, objectives and endpoints, design, population, intervention, discontinuation, assessments and safety, statistics, and supporting sections covering ethics, consent, data management and monitoring.
Is there an official protocol template?
ICH E6 defines the expected content and ICH M11 defines a harmonised structured template. In the US, the NIH and FDA publish a free template for Phase 2 and 3 IND and IDE studies. Sponsors often have their own.
What is the SPIRIT checklist?
Standard Protocol Items: Recommendations for Interventional Trials, a checklist of items a protocol should address. It was first published in 2013 and updated in 2025.
What is a schedule of activities?
A table of visits against assessments showing what happens at each visit. It is the blueprint for the database, the budget and site workflows.
Can software build a study from a protocol?
Yes. Capture's AI Study Generator reads PDF, DOCX or DOC protocols and drafts visits, windows and forms for human review.
How do I reduce protocol amendments?
Make criteria testable, keep the schedule consistent with the assessment descriptions, put volatile lists in appendices and review the draft with the people who will build and monitor the study.
Keep exploring
Related pages
Protocol to study setup
Generate the study from the protocol.
Clinical trial budget template
Cost the schedule of activities.
IRB submission checklist
What goes to the ethics committee.
Protocol amendments without change orders
When the protocol changes.
What is an endpoint?
Primary, secondary and exploratory.
Eligibility screening eCRF
Criteria as checkable questions.
Your protocol, running as a study this week
Upload the protocol, review the draft and test it free. No credit card.