Description
GGA Prenatal SNP (single nucleotide polymorphism) microarray is a genetic testing that can be performed with amniocentesis. It is a type of DNA array which is designed with high density (copy number variation) CNV+SNP probes to detect small variations across the whole chromosome set. The detection rate for fetal chromosomal abnormalities is higher than karyotyping (G-banding) and traditional oligo-microarray.
概述
染色体异常导致多种疾病
Small chromosomal variations can lead to excess or shortage of genes within that region, thus resulting in a person with medical problems, such as abnormal growth, development, and abnormal function of the body’s systems. Chromosome numeral or structural variants can result in a person with disorders such as Down syndrome, Prader-Willi syndrome, and DiGeorge syndrome. Pregnancy at an advanced age increases the fetal risk of chromosomal abnormality.
筛检或超音波检查胎儿异常后的第一线诊断检测
SNP microarray has been established as a useful diagnostic tool in pregnancy to detect fetal chromosomal abnormality. It could detect more chromosomal abnormalities than other existing testing methods and provides a more comprehensive genetic information of the fetus.

谁该考虑做Prenatal SNP microarray?
美国妇产科医学会 (ACOG) 和母胎医学学会 (SMFM) 建议所有孕妇不论年龄或其他因素,都应该要做孕期胎儿染色体筛检或诊断检测。 (Reference: Obstet Gynecol 2016;127:e108-22.)
Prenatal SNP microarray适用对象:
- 希望了解胎儿全面健康资讯之孕妇
- 有先天性染色体异常家族史或曾经产下染色体异常婴儿之孕妇
- 超音波检查,Karyotyping test,或其他胎儿筛检发现异常之孕妇
- Non-invasive Prenatal Test (NIPT) 因胎儿游离DNA含量比例过低而无结果之孕妇
- 多胞胎孕妇
- 进行Preimplantation Genetic Testing for Aneuploidy (PGT-A)后成功怀孕之孕妇
检体需求:
羊水: 10-15mL
*Other sample requirements (CVS or DNA) can be discussed further
GGA Prenatal SNP microarray 使用CNV (染色体数目变异)+SNP(分析基因型遗传资讯)双平台检测设计,可检测AOH(杂合性缺失)、UPD(单亲二体症)及全三倍体等,协助了解由染色体异常所导致的疾病。
为什么选择GGA Prenatal SNP microarray?
- 高密度双平台检测(CNV+SNP)可提高覆盖率和检出率
- 能侦测到更多的染色体变异,如:杂合性缺失AOH、单亲二体UPD和全三倍体Triploidy等
- 提供医护人员专业遗传咨询服务
- 美国病理学会认证(CAP)高品质检测实验室
- GGA在SNP microarray临床研究上收集了丰富的遗传和临床数据^
^References:
- J FORMOS MED ASSOC. Mar 2019, 118(3), 739-742
- Pediatrics and Neonatology. (2020) 61, 343-345
- Acta Obstet Gynecol Scand. 2020 Jun;99(6):775-782.
什么是SNP microarray小儿晶片?
SNP microarray是由高密度 CNV+SNP探针设计出来的技术,
可检测微小基因片段缺失、AOH(杂合性缺失)、UPD(单亲二体症)及全三倍体等,协助了解由染色体异常所导致的疾病。
什么时候需要做SNP microarray羊水晶片呢?
Prenatal SNP microarray适用对象:
- 希望了解胎儿全面健康资讯之孕妇
- 有先天性染色体异常家族史或曾经产下染色体异常婴儿之孕妇
- 超音波检查,Karyotyping test,或其他胎儿筛检发现异常之孕妇
- Non-invasive Prenatal Test (NIPT) 因胎儿游离DNA含量比例过低而无结果之孕妇
- 多胞胎孕妇
- 进行Preimplantation Genetic Testing for Aneuploidy (PGT-A)后成功怀孕之孕妇
与Low Pass Whole Genome Sequencing比较,SNP microarray晶片有什么优势呢?
SNP microarray是由高密度 CNV+SNP探针设计,可检测AOH(杂合性缺失)、UPD(单亲二体症)及全三倍体。Low Pass Whole Genome Sequencing没有SNP探针设计,因此会错过由AOH(杂合性缺失)和UPD(单亲二体症)所导致的严重疾病。SNP microarray可提供更全面的检查。
另外,SNP microarray的应用已发表过非常多的临床研究,也受到国际医学会的认可。
多久会收到SNP microarray报告呢?
一般上7-10工作天就会发出报告。
文件资料
Brochure
Clinical Papers Study
GGA research highlight