Can a Child’s Refusal Override Parental Permission?

Does the child's no take priority over the parent's yes?

A parent has authorized participation in a research study, but the child refuses. Who has the final say?

It is tempting to frame this as a contest between parental authority and children's autonomy. Research regulations approach the issue somewhat differently. The central question is whether the child's assent is a required condition of participation. If it is, a child's refusal means that required assent has not been obtained.

Under the U.S. HHS framework, when a child is capable of assent and the institutional review board (IRB) requires assent, a dissenting child cannot participate merely because a parent or guardian has granted permission. There are, however, specific circumstances in which the IRB may determine that assent is not necessary or may waive the assent requirement.

Yes, when the child's assent is required

Why “override” is useful shorthand but not the whole story

Parental permission and child assent are separate requirements

In research involving children, parental permission and child assent perform different functions. A parent's permission authorizes the child's participation when such authorization is required. Assent is the capable child's own affirmative agreement to participate.

When both are required, researchers need both. The parent's permission cannot be used to manufacture the child's assent, and the child's assent cannot replace required parental permission.

This is why a disagreement should not be reduced to asking whose opinion is “stronger.” The more precise question is whether all conditions required for enrollment have been satisfied.

HHS guidance directly addresses the disagreement

OHRP states that if a child is capable of assent and the IRB requires assent to be sought, assent must be obtained before participation. When such a child dissents even though the parent or guardian has granted permission, OHRP states that the child's decision prevails.

This follows from the regulatory definition of assent itself. Assent means affirmative agreement. Mere failure to object does not count. A clear refusal therefore cannot simultaneously be treated as affirmative agreement.

The practical implications of a parent giving permission while the child says no follow from this underlying requirement.

Not every child's assent is required in every study

The rule has an important qualification. Under 45 CFR 46.408, the IRB determines whether children are capable of providing assent, considering their ages, maturity, and psychological state. That judgment may apply to the participant group generally or to individual children.

If the capability of some or all of the children is so limited that they cannot reasonably be consulted, the IRB may determine that assent is not a necessary condition of participation.

This is one reason researchers should not decide capacity solely from age. The question of whether a child can meaningfully assent precedes the question of what legal or procedural consequence follows from refusal.

An important direct-benefit exception exists

HHS regulations also permit the IRB to determine that assent is not a necessary condition when the intervention or procedure involved in the research offers a prospect of direct benefit that is important to the child's health or well-being and is available only in the context of the research.

This exception is narrower than saying, “The study might help the child.” The regulation refers to an important prospect of direct benefit from the intervention or procedure and requires that it be available only in the research context.

Researchers should therefore not independently invoke potential benefit to override a child's refusal. The relevant determination belongs to the IRB under the applicable regulatory framework.

The IRB may also waive assent under applicable waiver provisions

Even when children are capable of assenting, HHS regulations allow an IRB to waive the assent requirement when the applicable conditions for waiver or alteration of informed consent under 45 CFR 46.116 are satisfied.

Again, this is a prospective regulatory determination. A researcher cannot wait until a child refuses and then decide that assent should have been waived.

A regulatory exception does not make the child's wishes irrelevant

There is an important distinction between saying that assent is not a necessary regulatory condition and saying that the child's preferences no longer matter.

A child may have understandable reasons for resisting a procedure: fear, pain, previous experiences, embarrassment, fatigue, or simply a strong desire not to participate. Even when an IRB has determined that assent is not necessary, researchers should remain attentive to the child's welfare and to the ethical significance of those concerns.

The applicable protocol, clinical circumstances, risk-benefit assessment, and IRB determinations may shape what should happen next. Regulatory authority to proceed should not be mistaken for an instruction to disregard the child.

A refusal should not be converted into agreement through pressure

If assent is meaningful only when it is affirmative, researchers need to be willing to receive a negative answer. Repeatedly asking a child after a clear refusal, recruiting a parent to pressure the child, or implying that adults will be disappointed can undermine the voluntariness of the process.

Clarification is different. If the child refuses because they incorrectly believe, for example, that a questionnaire involves a blood draw, the researcher may explain the misunderstanding accurately and allow the child to reconsider. The objective should be understanding, not conversion.

Refusal can occur after participation has already begun

A child may assent at enrollment and later change their mind. Assent should therefore not be viewed solely as a gate passed on the first day of a study.

In repeated or longitudinal research, investigators should anticipate how withdrawal of assent will be recognized and handled. The appropriate response may depend on the approved protocol, the remaining research activities, whether assent continues to be required, and whether any regulatory exception applies.

Do not confuse refusal with the absence of affirmative agreement

A child may clearly say no. That is straightforward dissent. But another child may never verbalize a refusal and still fail to provide affirmative agreement.

Because HHS regulations state that mere failure to object is not assent, researchers cannot automatically treat silence as permission to proceed. The more difficult problem of behavioral or nonverbal signs of unwillingness requires closer attention to how assent is actually expressed.

When the child's refusal prevents participation

Now imagine a fundamentally different protocol involving an intervention available only through the research that offers an important prospect of direct benefit to the child's health. The IRB could, if the regulatory conditions are satisfied, determine that assent is not a necessary condition. That is not the parent “winning” the disagreement. It is a different regulatory determination about whether assent is required in the first place.

Common mistakes about child refusal and parental authority

Ask whether assent is required before asking who “wins”

For protocol design, the useful question is not simply whether parents or children have greater authority. Determine the regulatory status of assent for the particular study and participant population first.

Your protocol should make these pathways clear enough that study personnel know what to do before disagreement occurs. Researchers conducting the assent discussion should know whether they are genuinely authorized to accept “no” as the end of recruitment. If they are not prepared to do so because an approved exception applies, that circumstance should be understood before approaching the child.

Before proceeding after a child's refusal, verify the assent status

Frequently asked questions about child refusal

Required assent cannot be supplied by the parent

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