Is a serious adverse event the same as a severe adverse event?

No, and confusing the two is a common mistake. Severity describes how intense an event is — a severe headache. Seriousness is a regulatory classification based on its outcome, such as hospitalization or death. A severe headache may not be serious; a brief hospital admission for a mild problem is.

Serious adverse event (SAE)

In Safety & pharmacovigilance

A serious adverse event is an adverse event that meets at least one defined seriousness criterion: it results in death, is life-threatening, requires or prolongs hospitalization, causes persistent or significant disability or incapacity, or is a congenital anomaly or birth defect. Other important medical events may also qualify if they could jeopardise the participant. Sites normally must report SAEs to the sponsor within 24 hours of becoming aware of them.

Why it matters

Missed or late SAE reporting is one of the most serious findings a site can receive, because it directly affects participant safety oversight.

Example

A participant is admitted to hospital overnight for observation after fainting. Because it required hospitalization, it is a serious adverse event even though they recovered fully by morning.

Common questions

Is a serious adverse event the same as a severe adverse event?: No, and confusing the two is a common mistake. Severity describes how intense an event is — a severe headache. Seriousness is a regulatory classification based on its outcome, such as hospitalization or death. A severe headache may not be serious; a brief hospital admission for a mild problem is.

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