TABLE 5.

Additional screening & testing in patients with repeated low fetal fraction (FF) cell‐free DNA (cfDNA) details the types of diagnostic or screening pursued in the 81 patients with known birth outcomes

Additional screening/testing type	Number of patients	Result
Postnatal	1	Normal
Products of conception	1	Normal
CVS	2	Normal
Amniocentesis	8	7 normal/1 abnormal a
Serum biochemical screening	5	Negative
cfDNA at another laboratory	3	Negative
	Total 20/81

^a Following NIPT, a twin pregnancy showed triploid in one twin and normal chromosomes on the other. Reduced to singleton and healthy fetus delivered at term.