Chorionic Villus Sampling for Early Prenatal Diagnosis
at Bhumibol Adulyadej Hospital
Wibool Rueangchainikhom MD*,
Saravut Sarapak BSc (MT)*, Nawaporn Orungrote MD*
Affiliation :
* Department of Obstetrics and Gynecology, Bhumibol Adulyadej Hospital, Bangkok
Objective : To evaluate results of chorionic villus sampling for early prenatal diagnosis at Bhumibol Adulyadej
Hospital.
Results : Retrospective descriptive study.
Results : Perinatal unit, Department of Obstetrics and Gynaecology, Bhumibol Adulyadej Hospital.
Results : Three hundred and eighty three women were enrolled to chorionic villus sampling at the perinatal
unit, Department of Obstetrics and Gynecology, Bhumibol Adulyadej Hospital, from November 10,1997 to
October 17, 2006.
Results : During the present study periods three hundred and eighty three women were recruited, of these
chorionic villus sampling for chromosome diagnosis were performed on 355 while 6 were for abnormal
Thalassemia screening. Twenty two cases were excluded because ultrasound examination showed anembryonic
pregnancy or fetal demise in utero in 13 cases, multiple fibroids in 4 cases, large area of placental hemorrhage
in 3 cases, 1 case of multiple pregnancy and in 1 case the placenta was in an inappropriate position. The most
common indication was elderly gravidarum (95.84%). Other indications were abnormal Thalassemia screen-
ing, abnormal ultrasound findings, family chromosome disorder, previous Down syndrome, and severe oligo-
hydramnios. The authors found eleven cases of chromosome abnormalities, four cases of maternal cell con-
tamination and three cases of failed tissue culture ( two cases from transcervical chorionic villus sampling
and one case from transabdominal chorionic villus sampling) and two cases of mosaicism. There were two
fetal losses in the present study and all the babies from the normal chromosome result looked normal. Second
trimester amniocentesis following chorionic villus sampling was required due to maternal cell contamina-
tion, mosaicism and failed tissue culture.(2.77%) All cases had follow-up ultrasound scan during 18-20
weeks.
Conclusion : The authors found that chorionic villus sampling is a possible alternative technique for prenatal
diagnosis of cytogenetic abnormalities and abnormal Thalassemia screening in Thailand. It probably has a
slightly higher rate of failed tissue culture and maternal cell contamination than amniocentesis, but it is
generally done earlier in pregnancy than amniocentesis and is particularly advantageous for detecting
certain genetic conditions.
Keywords : Prenatal diagnosis, Chorionic villus sampling
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