Comparison of Different Blood Collection, Sample Matrix, and Immunoassay Methods in a Prenatal Screening Setting

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              Comparison sample matrix. Passing-Bablok regression was performed on finger DBS versus finger serum for PAPP-A (a) and f<i>β</i>-hCG (b). Solid line, regression line; shaded area, 95% confidence interval; dashed line, identity line.</table>

Disease Markers

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Figure 2

Figure 2: Comparison of Different Blood Collection, Sample Matrix, and Immunoassay Methods in a Prenatal Screening Setting 