Objective To investigate the incidence and types of genic mutations for thalassemia in Shenzhen area and perform the prenatal diagnosis in high risk fetus.

目的调查深圳市孕妇地中海贫血发病率、基因突变类型，对高风险胎儿进行产前诊断。

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This is why, when one fetus dies, the risk of death for the co-twin can be as high as 60%.

这就是当一个胎儿死亡后，双胎的另一个体死亡率会高达60%的原因。

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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）。

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