DBS and venous characteristics associated with agreement between measurements
SAID
Of the DBS characteristics covariates tested, all impacted the association between serum and DBS measurements of at least one analyte. This means that models with an interaction between DBS values and the covariate in question significantly differed to the same nested model without said interaction. The number of spots influenced the agreement between venous and venous-equivalent DBS measures of HbA1c, the quality of DBS spots influenced the agreement between CRP measures, whether sample processing was delayed impacted HbA1c and total cholesterol, the number of days between collection of the DBS sample and − 70 °C storage also impacted HbA1c and total cholesterol such that adverse conditions tended to be associated with higher equivalence values. Days between venous blood collection and lab delivery was not significantly associated with any analyte (Supplementary Material 