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  1. Definition of the case report form
  2. Derivation of CRF design from the protocol
  3. Scope and limits of the electronic CRF (eCRF)

Academy · Research Writing · CRF

Case Report Form (CRF): Definition, Protocol-Driven Design and Electronic CRFs

A case report form (CRF) is the data-collection instrument of a clinical trial, not the data themselves. This distinction becomes consequential when a data query is raised and must be resolved against the source document.

Pubrica AcademyWritten by a clinical data manager Reviewed bya regulatory affairs consultant Published10 October 2026 Last checked10 October 2026 Reading time4 minutes Sources1 peer-reviewed

A Case Report Form (CRF) is a printed, optical or electronic document designed to record all the protocol-required information to be reported to the sponsor on each trial subject, as defined in ICH's Good Clinical Practice guideline.

Learning objectives

  • The definition of a CRF and its distinction from the trial database.
  • The reasons CRF design is determined by the protocol rather than by convenience.
  • The functions an electronic CRF (eCRF) adds to a paper CRF, and the principles it leaves unchanged.

Common misconceptions

  • “A CRF and the trial database are the same thing.” The CRF is the data-collection instrument used to capture protocol-required data from each subject; that data is then entered into, or electronically generates, the trial database — the two are related but distinct artefacts, and a query raised against the database is resolved by checking back against the CRF as the source document.

Definition of the case report form

ICH Good Clinical Practice guidance defines the Case Report Form as a printed, optical or electronic document designed to record all the protocol-required information to be reported to the sponsor on each trial subject1. It is the primary data-collection instrument of a clinical trial, completed by investigator-site staff for each participant at each protocol-defined visit or assessment.

Derivation of CRF design from the protocol

Each field on a well-designed CRF traces back to a specific protocol requirement — an eligibility criterion to confirm, an outcome to measure or a safety assessment to record. CRFs are typically designed and finalised alongside the protocol and statistical analysis plan (SAP), so that the data collected match the requirements of the planned analysis, rather than being assembled afterwards and found to lack a required field.

Scope and limits of the electronic CRF (eCRF)

An electronic CRF (eCRF) captures the same protocol-required data directly into an electronic data-capture system, often with built-in validation checks (range checks, required-field checks) that can detect some errors at the point of entry rather than later during data cleaning. An eCRF changes the capture mechanism, not the underlying principle: it must still be designed against the specific data requirements of the protocol, and it remains the source instrument against which a query is resolved.

Key points

Key points

A CRF is the protocol-driven data-collection instrument completed for each subject and is distinct from the trial database that it feeds. An eCRF alters the capture mechanism, adding built-in validation, without altering that underlying principle.

Practical application

Practical application

  1. CRF fields should be designed directly against protocol requirements. Each CRF field should be mapped to a specific protocol element before the form is finalised.
  2. CRFs should be finalised alongside the protocol and SAP, not after them. Before the trial opens, the study team should confirm that the data the CRFs will capture support the planned statistical analysis.
  3. Data queries should be resolved by reference to the CRF as the source document. The CRF (or eCRF entry) is treated as the source document when a database query requires resolution.

Frequently asked questions

No — the CRF is the data-collection instrument; the database is what the CRF data is entered into or electronically generates.

No — it can catch some errors at entry via validation checks, but queries for missing, inconsistent or implausible data still arise and are resolved against the CRF as source.

References

  1. International Council for Harmonisation (ICH). E6(R2): Good Clinical Practice. read 10 October 2026. View ICH E6(R2) Guideline

Every source above is a peer-reviewed article, a publisher’s record of one, or a standard issued by the body that owns it. Each carries the date it was last read. Where a standard moves, this article is revised rather than left up with a note.

How to cite this article

Pick your referencing style and copy it. Your university or target journal may vary the punctuation — check its guide if it has one.

Pubrica Academy. (2026, October 10). Case Report Form (CRF): Definition, Protocol-Driven Design and Electronic CRFs. Pubrica. https://pubrica.com/academy/abbreviations/crf-case-report-form/

This article is written to be learned from. Cite it if you are referring to what it says; if you are using the evidence behind it, cite the sources listed above instead.

CRF design check

Intended for use when finalising a CRF against the protocol.

[ ] Every CRF field traced to a specific protocol requirement
[ ] CRF finalised alongside the protocol and SAP
[ ] Validation checks built in, if electronic
[ ] Query-resolution process defined against the CRF as source

Pubrica AcademyWritten and maintained by Pubrica’s subject matter experts. Articles are revised when the underlying standards change, and each article states the date on which it was last reviewed.

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