Exempt vs. Expedited vs. Full Board: Which Review Do You Need?

The single biggest factor in how fast your IRB application moves is which of the three review levels it qualifies for: exempt, expedited, or full board. The level is not something you choose — it is determined by your study's risk profile and design against the criteria in 45 CFR 46.104 and 45 CFR 46.110. Knowing the rules before you submit lets you design for the fastest legitimate path.

What the three levels mean

Exempt review means your study is human subjects research but fits one of the categories in the Common Rule that exempts it from full regulatory oversight. It still requires IRB review and a determination letter — you do not self-exempt. Turnaround is typically 1 to 3 weeks.

Expedited review means the study involves no more than minimal risk and fits one of nine federally defined categories. A single IRB member, rather than the full board, can approve it. Turnaround is typically 2 to 6 weeks.

Full board review means the convened IRB must review the study at a scheduled meeting, with a majority vote required for approval. This is the default whenever the study does not qualify for exempt or expedited. Turnaround is typically 4 to 10 weeks depending on the meeting calendar.

Exempt categories in plain English

The exempt categories under 45 CFR 46.104(d) include:

• Research in established educational settings involving normal educational practices.
• Surveys, interviews, or observations of public behavior where responses are recorded without identifiers, or where disclosure would not reasonably place participants at risk.
• Secondary research using identifiable private information or biospecimens when certain conditions are met.
• Benign behavioral interventions with adults who prospectively agree.

Most exempt studies in student research are surveys with adults about non-sensitive topics. If you are studying illegal behavior, mental health diagnoses, or minors, you probably do not qualify for exempt even if your method is a survey.

Expedited categories in plain English

The nine expedited categories under 45 CFR 46.110 cover minimal-risk research including:

• Collection of blood samples by finger stick or venipuncture within specified limits.
• Non-invasive biological specimens collected routinely (saliva, hair, urine).
• Data from voice, video, digital, or image recordings.
• Research on individual or group characteristics using surveys, interviews, focus groups, or program evaluation when exempt does not apply.
• Continuing review of previously approved studies meeting certain conditions.

Most qualitative and interview research with adults on sensitive but low-risk topics lands in expedited.

When you need full board

Full board is required whenever any of the following are true:

• The study involves more than minimal risk.
• Participants include prisoners (with rare exceptions), or the study includes significant risk for pregnant individuals or fetuses.
• The study involves deception that could cause psychological distress.
• The intervention is investigational (drugs, devices) or invasive.
• The risk-benefit balance is complex enough that a committee judgment is warranted.

Children are not automatically full board — most non-invasive research with minors goes through expedited if the risk is minimal.

How to anticipate your category before submitting

Write a one-paragraph description of the study and score it against four variables: population, intervention, data sensitivity, and identifiability. A study with healthy adults, no intervention beyond surveys, non-sensitive topics, and de-identified data is almost always exempt. Swap any one of those for a sensitive topic or a vulnerable population and you move up a level.

If you are preparing a dissertation study, the dissertation IRB application guide on our sister site walks through how review level maps to your timeline. Missing your category by a step can cost a month.

Why students get the level wrong

The most common mistake is assuming that "just a survey" is automatically exempt. If the survey asks about mental health symptoms, substance use, immigration status, or sexual behavior, disclosure risk is real and the category moves from exempt to expedited. The second most common mistake is assuming that minors automatically trigger full board. They do not.

Your institution's IRB coordinator can often do a pre-check on your category if you email a one-paragraph summary. Take that offer if it exists. For more on how to write that summary, see our protocol writing guide, and for category-by-category requirements, see the review categories overview.

The practical takeaway

Design for the lowest legitimate review level. That means using de-identified data when possible, avoiding sensitive topics when they are not core to the research question, and recruiting adults when minors are not necessary. These choices are not ethical compromises — they are appropriate tailoring of risk to research question, and they cut weeks off your approval timeline.