Table 4. Relation of Titer of... | American Society of Hematology

Table 4.

Relation of Titer of Anti–HPA-1a at Different Stages of Pregnancy to Cord Blood Platelet Count for Antenatally Alloimmunized Women With HPA-1a–Positive Infants

Gestation (weeks)	n	Cord Platelet Count (10⁹/L)	Antibody Titer		P
Gestation (weeks)	n	Cord Platelet Count (10⁹/L)	≥1 in 32	<1 in 32	P
30-38	25	≥50	2	15
		<50	6^3-150	2^3-151	.004
20-29	17	≥50	3	8
		<50	5	1	.050
12-19	13	≥50	4	5
		<50	4	0	.11

Gestation (weeks)	n	Cord Platelet Count (10⁹/L)	Antibody Titer		P
Gestation (weeks)	n	Cord Platelet Count (10⁹/L)	≥1 in 32	<1 in 32	P
30-38	25	≥50	2	15
		<50	6^3-150	2^3-151	.004
20-29	17	≥50	3	8
		<50	5	1	.050
12-19	13	≥50	4	5
		<50	4	0	.11

P values determined by Fisher's exact test (two sided).

F3-150

Includes 1 infant with ICH.

F3-151

No other platelet alloantibodies.

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