As stated in ACOG practice bulletin 226, SNP-based NIPT (Panorama) is the only non-invasive method that can identify triploidy8
*Identical twins only
Panorama identified monozygotic twins with >99% sensitivity and specificity in a validation study.
While chorionicity can be reliably detected early in pregnancy, studies have shown that up to 19% of monochorionic pregnancies are incorrectly classified as dichorionic. Panorama allows clinicians to align their ultrasound findings with an early and accurate zygosity determination.
1Dar et al. Am J Obstet Gynecol. Epub prior to publication. https://doi.org/10.1016/j.ajog.2022.01.002
2DDar et al.Am J Obstet Gynecol. Epub prior to publication. https://doi.org/10.1016/j.ajog.2022.01.019
3Norton et al. Perinatal and genetic outcomes associated with no call cfDNA results in 18,497 pregnancies. Society of Maternal-Fetal Medicine, SMFM. Virtual Meeting. Oral Presentation. Jan 25-30, 2021.
4Nicolaides et al. Fetal Diagn Ther. 2014;35(3):212-7.
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6Nicolaides et al. Prenat Diagn. 2013 June; 33(6):575-9.
7Ryan et al. Fetal Diagn Ther. 2016;40(3):219-223.
8ACOG Practice Bulletin 226. Obstet Gynecol. 2020 Oct;136(4):859-867.
9Natera internal data on file.
10Norwitz et al. J Clin Med. 2019 Jun; 8:937.
11Martin KA et al. Am J Obstet Gynecol MFM. 2020;2:100152.
12Palomaki GE, et al. Prenat Diagn. 2020 Oct 5. doi: 10.1002/pd.5832. [Epub ahead of print].
13Hedriana H et al. Prenat Diagn. 2020 Jan;40(2):179-184.
14Society for Maternal-Fetal Medicine, Clinical guideline: Twin-twin transfusion syndrome, Jan 2013.
15American College of Obstetricians and Gynecologists and Society for Maternal-Fetal Medicine, practice bulletin #169, Oct 2016.
16Oldenburg et al. Ultrasound Obstet Gynecol. 2012 Jan;39(1); 39: 69–74.
17Chasen, Chervenak (2017). Twin pregnancy: Prenatal issues. In T. Post (Ed.), UpToDate. Waltham, Mass.: UpToDate. Retrieved from www.uptodate.com
18Cunningham et al. Williams Obstetrics. 24th edition. New York: McGraw-Hill Education, 2014.