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Agreement between protein concentrations measured in DBS samples by MRM (red diamonds) with clinical reference ranges from established immunoassays (black squares) for 11 FDA approved or cleared protein diagnostic targets: 1) alpha-1-acid glycoprotein 1, 2) alpha-1-antitrypsin, 3) alpha-2-macroglobulin, 4) apolipoprotein A-I, 5) ceruloplasmin, 6) Complement C1 inactivator, 7) complement C3, 8) complement C4 beta chain, 9) complement C4 gamma chain, 10) haptoglobin, 11) transferrin.
