Fig. 1. B12 concentration in human milk samples analyzed with reference method (dark grey), IMMULITE (light grey) and RA (white; A) and correlation between total HC and differences of B12 concentration based on analysis method tested (RA,
IMMULITE) compared to the reference values (a: Pearson’s correlation coefficient qRA-total HC: 0.8669, p = 0.0001; qIMMULITE-total HC: 0.2168, p > 0.05; B; slopes are significantly different (GLM procedure), p = 0.0023).