To set this cut-off, Olink has analyzed 2000 EDTA-plasma samples, and the results showed that 99.7% of all samples ended up between these limits for our internal controls.
We could also see that samples that deviated by more than +/- 0.3 NPX showed differences that affected data quality.
0.3 NPX equals a CV of 15%, so in other words, samples can differ by 30% from each other and still pass the quality control.