结论染色体异常是导致不良孕产史的重要原因。
Conclusion The abnormality of chromosome is one of the basic reasons of disfavorable pregnancy.
本术主要用于宫内诊断遗传疾病，不良孕产史，先天性溶血感染及血液系统疾病等。
Cordocentesis in this data used in cases with history of hereditary disease, obstetric abnormality, as well as congenital hemolytic infection and blood diseases etc.
其中超声示胎儿异常组染色体异常检出率（33.33%）明显高于21-三体高风险组（4.54%）、不良孕产史组的检出率（9.09%）（P<0.05）。
The detection rate of the chromosomal abnormality of the abnormal fetus detected by ultrasound (33.33%) was higer than the trisomy 21 high risk group(4.54%) and abnormal delivery group(9.09%)(P<0.05).
其中超声示胎儿异常组染色体异常检出率（33.33%）明显高于21-三体高风险组（4.54%）、不良孕产史组的检出率（9.09%）（P<0.05）。
The detection rate of the chromosomal abnormality of the abnormal fetus detected by ultrasound (33.33%) was higer than the trisomy 21 high risk group(4.54%) and abnormal delivery group(9.09%)(P<0.05).
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