采用羊水诊断胎儿遗传性疾病日益广泛。羊膜穿刺方法安全可靠。但某些技术问题如穿刺部位可以影响诊断的正确性,最可能的情况是穿刺母体膀胱抽出尿液。耻骨上穿刺尤易发生。尿液同羊水在外观上常不易区别,如误将尿液进行培养,结果会导致胎儿状态错误的解释;并耽误诊断的时间。羊水经干燥后呈树枝状结晶,而尿液则否。临床常籍此特点作为诊断胎膜早破的依 Amniotic fluid diagnosis of fetal genetic disease is increasingly widespread. Amniocentesis method is safe and reliable. However, some technical problems such as puncture site can affect the correctness of the diagnosis, the most likely situation is to puncture the urine of the mother’s bladder. The suprapubic puncture is particularly prone. Urine with amniotic fluid often not easy to distinguish in appearance, such as mistakenly urine culture, the result will lead to wrong interpretation of fetal status; and delay the diagnosis of time. Amniotic fluid after dendritic crystallization, while the urine is not. Clinical features of this feature as a diagnosis of premature rupture of membranes in accordance with