Research Article
Comparison of Different Blood Collection, Sample Matrix, and Immunoassay Methods in a Prenatal Screening Setting
Figure 1
Comparison blood collection method. Passing-Bablok regression was performed on finger versus vein serum samples for PAPP-A (a) and fβ-hCG (b). Solid line, regression line; shaded area, 95% confidence interval; dashed line, identity line.