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. 2022 Dec 31;513:113420. doi: 10.1016/j.jim.2022.113420

Fig. 4.

Fig. 4

Impact of time between sample collection and processing on assay OD ratios for phlebotomist acquired DBS collections. A. Mean difference between DBS and reference serum collections from testing performed in triplicate as a function of reference serum OD ratio. Each time point (i.e. 7, 14, 21 and 28 days post-collection) is denoted by a different colored line. B. Mean difference between DBS and reference serum collections from testing performed in triplicate at OD ratios of 0.8 and 1.1 (analytical decision cutoff values).