测定绒毛膜促性腺激素(hCG),可诊断妊娠及滋养计细胞肿瘤。测定方法有生物法及免疫法。后者可分为乳胶凝集抑制试验(简称乳胶法)、羊红细胞凝集抑制试验(简称血凝法)及放射免疫测定法(简称放免法)。生物法的正确性受动物个体差异影响,且来源受季节限制;乳胶法假阴性率较高;放免法虽正确率高、敏感性强,但因没备复杂,标本用血来源受限, Determination of human chorionic gonadotropin (hCG), can diagnose pregnancy and nourish cell tumors. Determination of biological methods and immunoassay. The latter can be divided into latex agglutination inhibition test (referred to as latex method), sheep hemagglutination inhibition test (referred to as hemagglutination method) and radioimmunoassay (referred to as radioimmunotherapy). The correctness of the biological method is affected by individual differences in animals and the source is limited by the season; the false-negative rate of latex method is higher; although the radioimmunoassay method has high accuracy and sensitivity, but the preparation is not complicated,