Table 1 Study objectives

Primary objectives

 • The positive incidence of the anti-HPA antibody in pregnant Chinese women.

 • The morbidity of NAIT in anti-HPA antibody-positive pregnant women in China.

Secondary objectives

 • Antigenic specificity of anti-HPA antibodies.

 • Association of the anti-HPA antibody with HLA genotype.

 • The relationship between the titre of the anti-HPA antibody and the clinical symptom severity of NAIT.