Five cases of subchorionic hematoma detected by ultrasonography in patients with threatened abortion are presented. Three of these subjects had antinuclear antibodies, and the remaining two subjects had anticardiolipin antibodies. We recommend that patients with subchorionic hematomas be tested for

Lupus and allied disorders, as well as anticardiolipin antibodies, are associated with poor fetal outcome. Re­ cently, a high prevalence of antinuclear antibody-pos­ itive serum was demonstrated in patients with recurrent pregnancy losses.! The incidence of anticardiolipin an­ tibody in the general obstetric population is 1% to 2%; it is approximately 40% in patients with a poor obstetric history.