In a tabular from, difference between internal and external quality control?

| Aspect | Internal Quality Control | External Quality Control |
|---------------------|--------------------------|--------------------------|
| Purpose | To monitor and improve the quality of testing within the laboratory | To assess the accuracy and reliability of testing performed by the laboratory compared to other laboratories |
| Frequency | Conducted regularly by laboratory staff | Conducted periodically by external agencies or organizations |
| Control materials | Uses control materials provided by the laboratory or commercially available | Uses control materials provided by external agencies or organizations |
| Feedback | Immediate feedback to laboratory staff for corrective action | Feedback provided after completion of external assessment |
| Independence | Controlled and managed by the laboratory itself | Independent of the laboratory being assessed |
| Cost | Generally lower cost as it is managed internally | Can be more expensive as it involves external agencies or organizations |
| Scope | Focuses on the internal processes and procedures of the laboratory | Focuses on the overall performance of the laboratory compared to other laboratories |