TABLE 3B.

Estimated number of apheresis PLT donations lost based on the deferral of ever-pregnant female donors with positive screening tests for HLA antibodies

Donation characteristic	Number of apheresis PLTs donations from female donors*	Percentage of total donations from donors of both sexes†	Proportion of female donors who could potentially have HLA antibodies‡	Number of apheresis PLT donations from female donors with HLA antibodies	Percentage of total donations from donors of both sexes†
Number of pregnancies
None	31,855	11.3	NA	NA
One	11,373	4.0	0.112	1,274	0.5
Two	21,943	7.8	0.223	4,893	1.7
Three	15,616	5.5	0.275	4,294	1.5
Four or more	14,719	5.2	0.322	4,740	1.7
Pregnancy history information
Donations from female donors without information on pregnancy history	9,227	3.3
Donations from never-pregnant donors	31,855	11.3
Donations from ever-pregnant donors	63,651	22.5		15,201	5.4
Total number of donations
Donations from female donors	104,733	37.1
Donations from male donors	177,567	62.9
Donations from female and male donors§	282,300	100.0		282,300	100.0

^*This number includes donations of apheresis PLTs with or without concurrent RBC and/or plasma.

^†Column percentages.

^‡Based on the REDS-II LAPS-I study and assuming that never-pregnant donors will not have any HLA antibodies.

^§From Table 1.