Significant Risk (SR)
Significant Risk (SR) is an FDA designation for an investigational device study posing serious potential harm to subject health or safety. SR studies require an approved Investigational Device Exemption before clinical investigation can begin.
What does Significant Risk (SR) mean?
Significant Risk (SR) is a category the U.S. Food and Drug Administration uses to classify studies of investigational medical devices that could pose a serious threat to the health, safety, or welfare of the people enrolled. The label generally applies to devices that are implanted, used to sustain life, or otherwise capable of causing substantial harm if they malfunction or are misused.
When a device study is deemed Significant Risk, the sponsor must obtain an approved Investigational Device Exemption (IDE) from the FDA before the clinical investigation can begin. This is a stricter pathway than the one for studies judged to carry only non-significant risk, which can proceed under institutional review board oversight alone.
Why is the Significant Risk determination important?
The SR designation acts as a gatekeeping mechanism that ensures higher-stakes device research receives federal review before any patient is exposed to the technology. It directly governs the regulatory steps, timelines, and documentation a sponsor must complete, so misjudging the classification can delay or invalidate a study.
Beyond compliance, the determination protects research subjects by aligning the level of oversight with the level of potential harm. For developers and investigators, understanding whether a device falls into this category is one of the earliest and most consequential decisions in planning a clinical trial.
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