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成熟水螅和其人工胚胎与受试物接触后，按照它们各自的形态学变化即可评价受试物的发育毒性。Ａ／Ｄ比是评价发育毒性的一个指标，即以成熟水螅的最低毒性浓度为分子，以人工胚胎的最低毒性浓度为分母计算得出的比值。当Ａ／Ｄ大于或等于３时，受试物有发育毒性，即在低于母体毒性时就可有害于胚胎；当Ａ／Ｄ小于３时，受试物无发育毒性，即只在母体产生毒性反应时才对胚胎有不利影响。由水螅试验得出的一些化合物的Ａ／Ｄ比与已报道的标准动物试验得出的Ａ／Ｄ比二者间的符合率达９３％。本测试方法无假阴性结果，假阳性结果约为７％，测试一个样品只需１５ｄ的时间，整个操作过程简单快速，易于掌握。因此不失为一较好的发育毒性初筛方法。
Mature hydatid and its artificial embryos after contact with the test substance, according to their respective morphological changes to evaluate the developmental toxicity of the test substance. The A / D ratio is an indicator of developmental toxicity, ie, the lowest toxic concentration of mature hydatid, and the lowest toxic concentration of artificial embryos as the denominator. When A / D is greater than or equal to 3, the test substance has developmental toxicity, that is less than maternal toxicity can be harmful to embryos; when A / D is less than 3, the test substance developmental toxicity, that is, only in the maternal production Toxicity when adverse effects on embryos. The A / D ratio of some of the compounds obtained from the hydroponic test was 93% consistent with the reported A / D ratio of the standard animal test. This test method has no false-negative result, the false-positive result is about 7%. It takes only 15 days to test a sample. The whole operation process is simple and quick and easy to grasp. Therefore, after all, a good method of screening for developmental toxicity.