Self-QC is the antidote to that discovery. It is the practice of reviewing your own work with the same skeptical eye that a monitor will bring to it -- before the monitor arrives. Not occasionally. Not when time permits. Every time, on every form, as a non-negotiable step in the data entry workflow.

In the previous lesson, you learned the read-transcribe-verify method for entering individual values from source to CRF. That method prevents errors at the point of entry. But even the most disciplined field-by-field verification will not catch every problem. Some errors only become visible when you step back and look at the form as a whole -- when you notice that a date precedes an event it should follow, or that a blood pressure reading has drifted 60 points from the prior visit without clinical explanation. And some errors only emerge when you compare data across forms -- when the adverse event onset date does not align with the concomitant medication start date, or when a laboratory draw date appears on a day when no visit was recorded.

This lesson teaches a structured self-QC routine that catches what field-level verification misses.

Self-QC is the antidote to that discovery. It is the practice of reviewing your own work with the same skeptical eye that a monitor will bring to it -- before the monitor arrives. Not occasionally. Not when time permits. Every time, on every form, as a non-negotiable step in the data entry workflow.

In the previous lesson, you learned the read-transcribe-verify method for entering individual values from source to CRF. That method prevents errors at the point of entry. But even the most disciplined field-by-field verification will not catch every problem. Some errors only become visible when you step back and look at the form as a whole -- when you notice that a date precedes an event it should follow, or that a blood pressure reading has drifted 60 points from the prior visit without clinical explanation. And some errors only emerge when you compare data across forms -- when the adverse event onset date does not align with the concomitant medication start date, or when a laboratory draw date appears on a day when no visit was recorded.

This lesson teaches a structured self-QC routine that catches what field-level verification misses.