A Clinical Research Coordinator (CRC) at a busy site discovers that a blood sample required for a key secondary endpoint, scheduled for the Week 4 visit, was missed for a participant who has already left the clinic. The protocol's visit window for this draw has now passed. How should the CRC best manage and document this situation?
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A
Ask the participant to return immediately, even though it is outside the protocol-defined window, to ensure the data is collected.
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B
Ignore the missed sample since it is for a secondary, not primary, endpoint.
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C
Wait until the next scheduled visit to draw the sample and label it as the Week 4 sample to complete the case report form.
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D
Document the event as a protocol deviation and report it to the investigator and, if required, the sponsor/CRO.