3.2.3. Precision and accuracy
The intraday accuracy, interday accuracy and precision were obtained by measuring the QC samples at 3 concentration levels, as described in Section 2. The intraday accuracy of RA detection was −0.21-1.32%, with precision below 2.39%, and that of A1 detection was −1.03-2.01%, with precision below 3.51%. The interday accuracy of RA detection was −2.53-0.42%, with precision below 1.32%, and that of A1 detection was −0.91-3.01%, with precision below 4.05%. Table 1 shows that the method’s overall reproducibility was acceptable.