γγ1.Before the examination, you need to prepare routine blood, four viruses (hepatitis B, hepatitis C, syphilis, AIDS), white belt routine, blood coagulation analysis, recent fetal ultrasound and a copy of ID card; 2.On the day of the chorionic villus biopsy, you can eat and drink water, pay attention to rest; 3.The best time for chorionic villus biopsy: 9 – 13 weeks + 6 days of pregnancy, according to the specific location of the chorionic villus to choose the best time for surgery; 4.After the chorionic villus examination, you need to rest in the hospital for 2 hours. Do not engage in physical labor after returning to the hospital, and review the fetal ultrasound after 1 week.γγThe items that can be diagnosed by chorionic villus biopsy: fetal DMD, hemophilia, albinism, phenylketonuria, deafness, various chromosomal diseases, early pregnancy paternity test, etc.