Table 1.

Number and characterization of antigen-negative pregnant women undergoing NIPD and their neonates (if available)

NIPD of	Number of tested antigen-negative women	Number of neonates with known phenotype/genotype
RHD	282 (85*) anti-D	174 (85*)
	160 (145*) without anti-D	155 (145*)
RHD+RHCE*C	76 anti-D+C	59
RHD+RHCE*C	5 anti-G	5
RHD+RHCE*E	13 anti-D+E	13
RHCE*E	13 anti-E	13
RHCE*c	24 (11*) anti-c	24
KEL*01	43 anti-K	43
HPA*1A	42 (11 anti-HPA-1a)	42

^*Cases previously described [8, 11].