TABLE 1.

Positivity rates in redraw group versus total tests shows the positivity rates in patients with singleton and/or multifetal pregnancies who had a successful redraw after a low fetal fraction failure versus total testers

Gestational status	Total sample positivity rate (>200,000)	Redraw sample positivity rate	Significance
Singleton & multifetal	1.1%	1.5% (9/593)	Not statistically significant p = 0.332
Singleton only	1.1%	1.3% (7/520)	Not statistically significant p = 0.582
Multifetal only	2.2% a	2.7% (2/73)	Not statistically significant p = 0.748

^a Multifetal data from Dyr et al. ²⁵ .