Sero-test, Preg-test and Gonavis, all immunological pregnancy reaction reagents prepared by TEIKOKU ZOKI, NIHON TOKETSU KANSO and MOCHIDA products for hemagglutination inhibition reaction, were used clinically to evaluate their efficacy. It was found that each of these reagents showed the diagnostic correctness of about 100 % as a means of auxiliary pregnancy. Moreover, the simplicity of the procedures and the shortness of determining time are worthy enough to recommend as a practical and excellent method of pregnancy diagnosis.
