The 24-Hour Clock Starts at Awareness

Part of Research Nurse (RN) Training: Serious Adverse Events and the Clock.

About 2 minutes. Free, in your language, no account needed.

Why this matters

Most protocols require serious adverse events to reach the sponsor within 24 hours. The question that decides whether you are compliant is when those 24 hours began.

The answer is almost always: when the site first became aware.

Awareness, not onset

If an event happened eight days ago and the participant tells you today, the site became aware today. The clock starts today.

The onset date is still eight days ago and it goes in the report. Onset and awareness are two different fields and they are frequently different values.

A participant reporting late does not make the site late.

Awareness means any site staff

If a colleague was told last Tuesday and did not pass it on, the site became aware last Tuesday. Not today, when you found out.

This is why events get reported late even when the person filing the report acted immediately. The clock had already been running.

Tell someone immediately, and record when you told them.

What "reach the sponsor" means

Not that you started filling in the form. That the report was submitted by the route the protocol specifies.

Know the route before you need it. Know the out-of-hours route too. A serious event on a Friday evening is not a Monday problem.

Incomplete information is not a reason to wait

Send what you have within the window. Follow-up reports exist for the rest.

A report saying "participant admitted yesterday with chest pain, details to follow" filed on time is correct. A complete report filed on day three is late.

In practice

You learn at 16:45 on a Friday that a participant was admitted on Wednesday.

You do not wait for the discharge summary. You notify the investigator now, submit what is known through the specified route, and record the time you became aware.

The summary follows next week as a follow-up report.

What this looks like when it goes wrong

A site waits for hospital records before submitting, believing an incomplete report looks careless.

The report arrives on day five. The sponsor's own regulatory clock, which depends on the site's, is missed. A reportable event reached the authority late because a site was being thorough.

Thoroughness is not a defense against a deadline.

Key takeaways