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Cytogenetic analysis of 570 first trimester chorionic villi samplings: technique and results.
Annales de Génétique
In this report we present our experience based on 570 chorionic villi samplings performed by the transcervical method at 8 to 12 weeks gestation. Cytogenetic results were obtained for 551 samples, hence a failure rate of 3.33%. The previously described technique was modified by prolonging the incubation period to 48 hours. The total number of abnormalities was 26, which represents 4.71% of our sample. Of 24 chromosomal abnormalities, 21 were unbalanced and 3 were balanced of parental origin. Five discordant cases are thoroughly discussed.
Chorionic Villi/*ultrastructure Chromosome Aberrations/*diagnosis Chromosome Disorders Female Humans Methods Pregnancy Pregnancy Trimester, First *Prenatal Diagnosis Sex Chromosome Aberrations/diagnosis
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