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Single Nucleotide Polymorphism-Based Noninvasive Prenatal Testing: Experience in India.

A new interesting article has been published in J Obstet Gynaecol India. 2018 Dec;68(6):462-470. doi: 10.1007/s13224-017-1061-9. Epub 2018 Jan 25. and titled:

Single Nucleotide Polymorphism-Based Noninvasive Prenatal Testing: Experience in India.

Authors of this article are:

Verma IC, Puri R, Venkataswamy E, Tayal T, Nampoorthiri S, Andrew C, Kabra M, Bagga R, Gowda M, Batra M, Hegde S0, Kaul A, Gupta N, Mishra P, Subramanian JG, Lingaiah S, Akhtar R, Kidangan F, Chandran R, Kiran C, Ravi Kumar GR, Ramprasad VL, Kadam P.

A summary of the article is shown below:

Introduction: Noninvasive prenatal testing (NIPT) has revolutionized prenatal screening for chromosomal aneuploidies in some countries. Its implementation has been sporadic in developing countries. Given the genetic variation of the people in different countries, we evaluated the performance of the SNP-based NIPT in India .Materials and Methods: The Panorama™ NIPT was performed in 516 pregnancies, which had tested intermediate-to-high risk on conventional first and second trimester screening. Results were confirmed either by invasive diagnostic testing or by clinical evaluation after birth.Results: Of 511 samples analyzed, results were obtained in 499 (97.7%). Of these, 480 (98.2%) were low risk and 19 were high risk. A sensitivity of 100% was obtained for detection of trisomies 21, 18, 13 and sex chromosomal abnormalities. The specificity ranged from 99.3 to 100% for abnormalities tested. Taken together, the positive predictive value for trisomies 21, 18, 13 and monosomy X was 85.7%. The average fetal fraction was 8.2%, which is lower than the average observed elsewhere.Conclusion: This is the first report of detailed experience with NIPT in India and demonstrates comparable performance in all aspects of testing to the results elsewhere.

Check out the article’s website on Pubmed for more information:

This article is a good source of information and a good way to become familiar with topics such as:

Chromosomal aneuploidies;India;NIPT;Prenatal screening;SNP;Trisomy 13;Trisomy 18;Trisomy 21


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