Among the fetal abnormality cases observed during the ultrasound examination, there were 47 ones with abnormal karyotype (24.6 %). Among them, 13 cases were with trisomy 21; 5 cases with trisomy 18; 1 case with trisomy 13; 2 cases with triploidy (69); 7 cases with karyotype 45,X; 1 case with karyotype 47,XXY; and 18 cases with other abnormal chromosome structures.