PIP: In 1971 at the University of Novi Sad, Novi Sad, Yugoslavia, the reliability of results of the Pregnosticon "All-in" test, an immunological test for early diagnosis of pregnancy which is sensitive at 1500 IU of human chorionic gonadotropin, was studied in 107 patients, aged 18-45. Each test ampule contained lyophilized antiserum of rabbits immunized by a purified choriongonadotropin and lyophilized erythrocytes sensitized by choriongonadotropin, to which was added .1 ml of urine with .4 ml of distilled water. A positive test is indicated by sedimentation of erythrocytes in the shape of a ring 2 hours after performing the test. Percentage of correct results was 98.13%, confirming good results of other investigators. The test is considered to have very high clinical value in obstetrical and gynecological practice.