Trisomy 21

Trisomy 21, also known as Down's syndrome (or DS) is a genetic disorder caused due to an extra copy of genetic material in chromosome number 21. It causes a characteristic facial appearance, developmental delay and learning disabilities.

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When is double marker test indicated?

Query: Hello doctor,My wife is 28 years old and is in her 13th week of pregnancy. We had an NT test a couple of days back. The NT was 1.7mm. Trisomy 21 had an adjusted scale of 1:3428. Our doctor has advised us to go for a double marker test. The results will be out in two to three days. Is a risk of 1 in ...  Read Full »


Dr. Shalaka Joshi

Answer: Hello, Welcome to icliniq.com. The NT (nuchal translucency) test and double marker are dependent on each other. A risk of 1 in 3428 is not considered high. You have been asked to go for a blood test so as to conclude the results, as only NT test is not sufficient. For the double marker, NT measureme...  Read Full »

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