Manuel B. Garcia

Manuel B. Garcia serves as the Senior Director for Educational Technology and Digital Learning at FEU Institute of Technology, Manila, Philippines. Read More

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Part 5 · Guide 106 of 398

Can a Participant Give Valid Consent Without Signing Anything?

In some research, valid informed consent can be obtained without the participant signing a consent form. Whether this is permitted depends on the study, governing framework, and appropriate ethics or regulatory authorization.

By Manuel B. Garcia
106
Consent Without a Signature Guide 106 of 398
01 · The Question

If nobody signs a form, has informed consent actually occurred?

Researchers are often taught a familiar sequence: explain the study, hand the participant a consent form, obtain a signature, and begin data collection.

That sequence is common, but the signature and the consent are not the same thing.

In some research settings, a participant can make an informed and voluntary decision without signing a consent form. What researchers cannot safely do is assume that a signature is optional simply because another method seems more convenient.

The key distinction is between obtaining informed consent and documenting that consent with a signature.

02 · The Short Answer

Yes, but only when the applicable requirements allow it

In Brief

Yes. In some circumstances, a participant can give valid informed consent without signing anything, provided that informed consent is properly obtained and the applicable ethical, institutional, legal, and regulatory framework does not require signed documentation or an authorized waiver of that requirement has been granted.

Do not confuse permission to proceed without a signature with permission to proceed without informed consent. Waiving documentation and waiving the consent process itself are different decisions.

03 · What You Need to Know

When consent and signatures come apart

The easiest way to understand unsigned consent is to separate the participant's decision from the method used to record it.

Informed consent The process through which a person receives relevant information, can understand what matters to the decision, and voluntarily agrees to participate.
Signed documentation A particular method of recording consent using a participant's or authorized representative's signature.

A signature can be an important form of documentation without being what creates informed consent.

Some research frameworks normally require a signature

Researchers should not begin with the assumption that signatures are optional.

Under the U.S. Common Rule, for example, informed consent for covered research is ordinarily documented using a written consent form approved by the institutional review board and signed by the participant or the participant's legally authorized representative. The person signing must also receive a copy of the consent form.

Electronic signatures may satisfy the written documentation requirement under appropriate circumstances. OHRP states that electronic signatures may be used when they are legally valid in the jurisdiction where the research is conducted and the relevant requirements are satisfied.

Other jurisdictions and research frameworks may impose different documentation requirements. Researchers therefore need to identify the rules actually governing their study rather than generalizing from one system.

Some frameworks allow signed documentation to be waived

A requirement for a signed form may sometimes create little additional protection or may itself create a problem.

Under 45 CFR 46.117, for example, an IRB may waive the requirement for a signed consent form in specified circumstances. These include certain situations where the consent document would be the only record linking the participant to the research and the principal risk would arise from a breach of confidentiality. Waiver may also be possible for certain minimal-risk research involving no procedures for which written consent is normally required outside the research context.

The revised Common Rule also provides a pathway, under specified conditions, for research involving members of a distinct cultural group or community in which signing forms is not the norm, provided the research presents no more than minimal risk and there is an appropriate alternative mechanism for documenting that informed consent was obtained.

These are regulatory examples, not universal criteria. Another jurisdiction or institution may use different standards.

A waiver of documentation is not a waiver of consent

This is the most important distinction in this topic.

Waiver of documentation The participant may not need to sign the consent form or another specified written record, but an informed-consent process may still be required.
Waiver or alteration of informed consent Some or all ordinary consent requirements themselves may be waived or modified when the applicable criteria are satisfied and the appropriate authority approves it.

If an ethics committee or IRB waives the signature requirement, the researcher should not interpret that as permission to skip explaining the study.

The participant may still need to receive the relevant information, have an opportunity to ask questions, and voluntarily agree before research procedures begin.

Whether informed consent itself may be waived is therefore a separate question.

Why might requiring a signature be inappropriate?

Consider confidential research involving a highly sensitive topic. If the research otherwise collects no identifying information, the signed consent form might become the only document connecting a person's identity to participation.

In such circumstances, requiring a signature could create an informational risk rather than reduce one. This is one reason some regulatory systems allow waiver of signed documentation under specified conditions.

There may also be settings in which signing formal documents is culturally unusual or inappropriate, although researchers should not make assumptions about a community's practices. Any alternative approach should be developed appropriately and satisfy the governing ethical and regulatory requirements.

Unsigned consent does not necessarily mean undocumented consent

A useful distinction is often missed here.

"The participant did not sign anything" does not necessarily mean "there is no record that consent occurred."

An approved protocol might require the researcher to record in the research file that verbal consent was obtained, use a witness, document the date and version of the information provided, or follow another authorized procedure.

The 2024 Declaration of Helsinki provides a clear example from medical research. It states that freely given informed consent should be formally documented on paper or electronically and, when consent cannot be expressed in those ways, non-written consent must be formally witnessed and documented.

So non-written consent should not be interpreted as casual or undocumented consent.

Participants may still receive written information

Waiving a signature does not necessarily mean eliminating written participant information.

Under the U.S. Common Rule, when signed documentation is waived, the IRB may require the investigator to provide participants with a written statement regarding the research.

A study could therefore use an information sheet that participants keep without asking them to sign it. The approved consent conversation might then establish whether they wish to participate.

This can preserve the informational value of written material while avoiding a signed record when such a record is unnecessary or problematic.

Verbal agreement still needs to be informed

"Do you agree to participate?" is not an adequate verbal consent process merely because the participant says yes.

The same substantive concerns remain: appropriate information, comprehensibility, voluntariness, opportunity for questions, and whatever additional protections the study requires.

The medium of agreement does not lower the ethical standard.

Silence is not automatically consent

The absence of a signature should also not encourage researchers to treat non-refusal as agreement.

A participant who does not object, does not close a webpage, or remains in a room has not necessarily provided valid informed consent. Some research legitimately uses implied forms of consent, but the conditions under which behavior can indicate agreement require separate consideration.

For example, whether completing a survey can constitute implied consent depends on how the research is structured, what participants were told beforehand, and the applicable ethical and regulatory requirements.

The approved protocol determines what researchers should actually do

Even when a regulatory framework permits a waiver of signed documentation, that does not mean an individual researcher can decide during recruitment that signatures are unnecessary.

The consent method should be part of the reviewed research procedure where ethics review is required. Researchers should follow the approved protocol and any conditions imposed by the ethics committee, IRB, institution, funder, or applicable law.

Watch Out

Do not remove the signature because the study is "only a survey," "only an interview," or "minimal risk." Risk level may be relevant to whether a waiver is available, but the appropriate authority must make any determination required under the framework governing the research.

04 · A Practical Example

When the signature could create the risk

Hypothetical Example

Anonymous interviews about a highly sensitive experience

A researcher plans minimal-risk interviews about a sensitive personal experience. The study is designed not to retain names or other direct identifiers with the interview data. The researcher realizes that signed consent forms would create a separate record linking participants' identities to the study.

Problem The signed form could become the clearest identifiable record connecting an individual with participation in sensitive research.
Researcher's proposal The researcher proposes an oral consent process supported by a participant information sheet that explains the study, risks, confidentiality arrangements, voluntary nature of participation, and contact information.
Ethics review The researcher asks the appropriate ethics review body whether the governing framework permits waiver of signed documentation and describes how consent would instead be obtained and recorded.
If approved Participants receive the required information and can ask questions. The researcher obtains their verbal agreement and documents consent using the procedure authorized for the study without collecting participant signatures.
Interpretation The absence of a signature does not make the consent less informed. The validity of the process depends on whether the participant was adequately informed and freely agreed, and whether the alternative documentation procedure complied with the applicable requirements.
05 · What Researchers Often Get Wrong

Common misunderstandings about unsigned consent

Misconception

"No signature means no informed consent."

Not universally. Some research may legitimately obtain informed consent without a participant signature when the governing framework and approved procedure permit it.

Misconception

"Verbal consent means I do not need to document anything."

Not necessarily. An approved verbal-consent procedure may still require the researcher to document that consent occurred, use a witness, provide written information, or maintain another record. Requirements vary by framework and study.

Misconception

"If documentation is waived, consent is waived."

No. Waiving the requirement for a signed consent form and waiving informed consent itself are distinct actions. The participant may still need to undergo a full informed-consent process.

Misconception

"Minimal-risk studies never need signatures."

Minimal risk can be relevant to some waiver criteria, but it does not create a universal exemption from documentation. The applicable rules and approved protocol determine what is required.

Misconception

"I can switch from written to verbal consent if recruitment becomes difficult."

Not simply for convenience. If the approved study requires written consent, changing the consent method may require prior ethics or institutional approval. Researchers should follow the protocol rather than improvising a different consent procedure during data collection.

06 · What This Means for You

Decide whether the signature adds protection or merely paperwork

The appropriate question is not "Can I avoid getting signatures?" It is "What consent and documentation procedure appropriately protects participants and satisfies the requirements governing this study?"

A simple decision framework

If signed documentation is required for your study
Obtain the required signature using the approved procedure.
If the signature itself could create a meaningful confidentiality risk
Determine whether the applicable framework permits an authorized waiver of documentation and raise the issue during ethics review.
If the study is minimal risk and no comparable non-research procedure normally requires written consent
Check whether this creates a possible basis for waiver under the framework governing your study rather than assuming that it does.
If a signature is waived
Identify exactly how participants will be informed, how agreement will be expressed, and how the consent process must be recorded.
If you want to change the approved consent method
Obtain any required amendment or ethics approval before implementing the change.

Once the appropriate method is established, the next issue is choosing how consent should actually be communicated and recorded. Written, verbal, and electronic consent each have legitimate uses, but none is automatically appropriate for every study.

07 · A Quick Checklist

Before using consent without a signature

Before proceeding without signed consent, check:
Does the ethical, legal, institutional, and regulatory framework governing the study permit consent without a participant signature?
If a waiver of signed documentation is required, has the appropriate ethics committee or IRB actually granted it?
Have you distinguished waiver of documentation from waiver or alteration of informed consent itself?
Will participants still receive all information required for an informed decision?
Will participants have an adequate opportunity to ask questions and decide voluntarily?
Does the approved procedure specify how verbal or other non-written agreement will be recorded?
Must participants receive a written information sheet or another record of the research?
If a witness or other alternative documentation is required, have those arrangements been incorporated into the consent procedure?
08 · Frequently Asked Questions

Questions about informed consent without signatures

Is verbal consent legally valid in research?

It can be valid in some research contexts, but there is no universal answer across jurisdictions and regulatory systems. Researchers need to determine whether the applicable law, ethical framework, institutional requirements, and approved protocol permit a verbal consent procedure.

Does verbal consent have to be recorded?

It may need to be documented even when participants do not sign anything. The approved procedure might require a research record, witness, information sheet, or another mechanism. Requirements depend on the study and governing framework.

Can I simply write "verbal consent obtained" in my notes?

Only if that method satisfies the approved protocol and applicable requirements. A researcher's note should not be treated as a universal substitute for whatever documentation the study is required to use.

Can participants receive an information sheet without signing it?

Yes, in some approved consent procedures. Written information and signed documentation serve different functions. A participant may receive written study information while agreement is obtained and documented through another authorized method.

Can an anonymous online survey use consent without a signature?

Potentially, depending on the governing framework and ethics approval. Some studies provide the relevant consent information before the questionnaire and use the participant's decision to proceed as an indication of agreement. That should not be assumed to be appropriate for every survey.

Who decides whether the signature requirement can be waived?

That depends on the framework governing the research. Where ethics or regulatory authorization is required, the researcher does not simply declare the signature unnecessary. The appropriate reviewing or authorizing body must make the determination under the applicable criteria.

09 · The Bottom Line

Consent can exist without a signature, but not without a valid process

The Bottom Line

A participant can sometimes give valid informed consent without signing anything, but only when the applicable requirements and approved research procedure allow consent to be obtained without signed documentation.

The absence of a signature should never be mistaken for the absence of a consent process. If signed documentation is waived, researchers still need to know what information must be provided, how agreement will be obtained, and how that process must be documented under the framework governing the study.

10 · Sources and Further Reading

Authoritative sources on consent without signatures

11 · Cite this Guide

How to Cite This Guide

This guide is intended to be read, shared, and used in research, teaching, and academic work. If you draw on its ideas, explanations, or other content, please acknowledge the source by citing the guide. Doing so gives appropriate credit and helps your readers locate the original resource.

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