孕中期经腹羊膜腔穿刺,作遗传疾患研究时,可能刺入母体膀胱,抽出尿液而不觉察。虽说是抽羊水,但抽的却是尿液。作者利用羊水在空气中的自然干燥时可出现金鱼草样结晶的特征,来鉴别母尿抑或是羊水。用随机单盲法,25例中有24例借金鱼草样结晶试验确诊为羊水。然而同一患者当时排出之尿液标本中,却无一份出现此金鱼草样结晶。此研究表明,孕中期,鉴别母尿与羊水,金鱼草样结晶试验是可靠的。外观上,尿液与羊水常不易分清,若将 In the second trimester of transabdominal amniocentesis, genetic disorders research, may penetrate the maternal bladder, out of the urine without detection. Although it is amniotic fluid, but the pumping is urine. The author uses amniotic fluid in the air when the natural drying may appear the characteristics of the snapdragon-like crystals to identify mother’s urine or amniotic fluid. With a randomized single-blind method, 24 of 25 cases were confirmed as amniotic fluid by the snapdragon-like crystal test. However, the same patient was excreted in the urine specimens, but not a copy of this snapdragon-like crystals. This study shows that in the second trimester, identification of urine and amniotic fluid, snapdragon-like crystallization test is reliable. Appearance, urine and amniotic fluid often difficult to distinguish, if will