What It Means for Your Study
What It Means for Your StudyWhen submitting a research study for IRB review, one of the first and most important questions is whether your project involves minimal risk to participants. This determination plays a central role in how your study is reviewed — whether it qualifies for exempt, expedited, or full board review.
Understanding what “minimal risk” really means can help researchers set appropriate expectations, design ethically sound studies, and streamline the IRB process.
What Does “Minimal Risk” Mean?
According to federal regulations (45 CFR 46.102), minimal risk means:
“The probability and magnitude of harm or discomfort anticipated in the research are not greater in and of themselves than those ordinarily encountered in daily life or during routine physical or psychological examinations.”
In simpler terms, if participation in your study exposes individuals to no more risk than they would typically face in everyday life, it’s considered minimal risk.
Examples of minimal risk activities might include:
Anonymous surveys on non-sensitive topics
Interviews or focus groups discussing general opinions
Routine physical measurements (such as height or blood pressure)
Collection of existing data without identifiers
Minimal risk doesn’t mean no risk — it just means the potential harms are minor, predictable, and not likely to have lasting effects on participants.
How Minimal Risk Affects the Level of IRB Review
The level of risk in a study is directly tied to the level of IRB review required. Understanding these distinctions helps researchers prepare accurate submissions and avoid unnecessary delays.
1. Exempt Review
A study that involves no more than minimal risk and falls into specific federal exemption categories may qualify for exempt review.
Exempt does not mean “no review.” It means the study meets criteria that exempt it from ongoing IRB oversight after initial determination. These categories often include:
Educational practices or classroom-based research
Anonymous surveys or interviews
Use of existing, de-identified data
At Solutions IRB, exempt reviews are still carefully evaluated to confirm that all exemption criteria are met and that the research truly involves only minimal risk.
2. Expedited Review
Studies that involve no more than minimal risk but don’t fit within exempt categories typically qualify for expedited review.
This level of review allows a single IRB reviewer (rather than the full board) to assess the study, leading to a faster process. Examples include:
Surveys collecting identifiable but non-sensitive information
Collection of small amounts of blood from healthy volunteers
Noninvasive physiological recordings (such as heart rate or EEG)
Even under expedited review, the IRB ensures that confidentiality, consent, and participant welfare are protected.
3. Full Board Review
If a study involves greater than minimal risk, it must undergo full board review. This means the research is reviewed by the convened IRB to ensure that all potential risks are identified, justified, and minimized.
Examples of greater than minimal risk include:
Studies involving sensitive or potentially distressing topics
Research with vulnerable populations (children, prisoners, or individuals with impaired decision-making capacity)
Collection of identifiable data that could pose harm if disclosed
Interventions that could cause physical or psychological discomfort
Full board review allows multiple reviewers to provide a comprehensive assessment of risk and participant protections.
Key Takeaway: Minimal Risk ≠ Exempt Automatically
One of the most common misconceptions among researchers is that a minimal risk study automatically qualifies as exempt. That’s not the case.
Minimal risk is a threshold, not a category. A study may involve minimal risk and still require expedited or even full board review — depending on the population involved, data sensitivity, and research procedures.
Only studies that meet the specific regulatory exemption categories can be determined “exempt.” If your study involves identifiable information, sensitive topics, or vulnerable populations, it may still require expedited or full board review even if the overall risk remains low.
Final Thoughts
Determining whether a study is minimal risk is one of the first steps an IRB takes when reviewing a protocol. For researchers, understanding this distinction is essential. It sets realistic expectations, helps ensure participant safety, and guides you toward the right level of review.
At Solutions IRB, our team carefully evaluates each study to determine the appropriate review category — whether exempt, expedited, or full board — based on the true level of risk and the specific research activities involved. We provide clear, personalized guidance to help researchers navigate these decisions and move forward confidently.