QC testing
QC testing is usually performed on artificial samples purchased from PoCT manufacturers or other commercial sources. The samples have different known levels of analytes to cover the range that practices might encounter clinically.
QC testing is conducted on the samples, QC results are recorded, then compared with the target range or acceptable window that the practice has been given.
Results falling within this range are considered acceptable. Results falling outside this range are unacceptable and may indicate a problem with the testing process.
The PoCT manufacturer can provide a simple quality control record sheet to enter, review and analyse QC results.
An acceptable window for QC results is usually determined when you first implement a PoCT device. It is recommended that QC results fall within the manufacturer’s specified limits and that practices can demonstrate that they have a system for ensuring appropriately timed QC.
Standard decision-making rules are used to determine whether to accept or reject the QC results. QC test results must be recorded, and action must be taken should the QC result fall outside the acceptable range.11
Reviewing quality control results
It is important that the clinical team member responsible for PoCT:
- regularly reviews QC results
- investigates unacceptable results or performance
- records any remedial actions taken.