Medline query with keywords “antiprothrombin antibodies” and “pregnancy/obstetric/miscarriages/fetal loss” in various combinations yielded the documented reports. R: retrospective study, R(M): retrospective study with multivariate analyses, P: prospective study, RCC: retrospective case control study, ns: not significant, WG: week of gestation, OR: odds ratio, and Sensit.: diagnostic sensitivity.