According to 21 CFR 312, an investigator is required to report a serious adverse event (SAE) to the sponsor:
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A
Within 24 hours of becoming aware of the event.
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B
Immediately, regardless of whether it is considered drug-related.
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C
Within 7 calendar days if it is unexpected and life-threatening.
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D
Only after confirming the event is directly caused by the investigational product.