NEW YORK (GenomeWeb) – Genetic testing firms Counsyl and Natera are sparring over a study published by Counsyl in March that used mathematical simulations to explore how two noninvasive prenatal testing methods that are used by the companies compare in cases with very low fetal DNA fractions.

Appearing in Prenatal Diagnosis, the study juxtaposed simulated results from the shotgun sequencing approach at the heart of Counsyl's commercial NIPT and the SNP-based method commercialized by Natera.