We generally use the Mean of Replicates method, although Luminex prefers the Fit of All Standards approach.
Ultimately, the choice between the two methods is left to the researcher to determine the best option for their SOP. Importantly, this choice does not significantly impact sample results.
Here's a brief overview of the two methods:
Fit of all standards: This method determines the standard curve by using each individual standard replicate when calculating the standard curve. For instance, if duplicates of a 7-point standard curve are run, the software will calculate the standard curve using 14 points. This method applies only to quantitative analysis.
Mean of replicates: This method involves averaging the individual standard replicates when calculating the standard curve. Similarly, this method applies only to quantitative analysis. For instance, if duplicates of a 7-point standard curve are run, the software will calculate the standard curve using 7 averaged points.