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

Figure 5

Finger DBS antibody array versus vein serum AutoDELFIA, for PAPP-A (a) and fβ-hCG (b). Solid line, Passing-Bablok regression line; shaded area, 95% confidence interval; dashed line, identity line.

(a)

(b)