We analyzed 117 histories of pregnancy obtained from 40 female patients with Sjögren's syndrome (SS) including 13 patients with primary SS and 27 patients with secondary SS. The frequency of spontaneous abortions did not differ in the 40 patients and those with primary SS compared with 129 healthy women. However, both spontaneous abortions and premature deliveries were significantly more frequent in the SS patients with systemic lupus erythematosus (SLE). Anti-SS-A and anti-SS-B antibodies were not associated with the outcomes of pregnancy although spontaneous abortions were more frequent in secondary SS patients with false positive serological tests for syphilis, anti-erythrocyte antibodies, thrombocytopenia or prolonged activated partial thromboplastin time. Neither congenital anomalies nor connective tissue disease was found in the 77 neonates of the patients. We concluded that SS does not influence the outcome of pregnancy except in patients with SLE or those with serological and hematological abnormalities related to lupus anticoagulants or antiphospholipid antibodies.