Fetal Fraction in Maternal Plasma Cell-Free DNA at 11–13 Weeks Gestation: Effect of Maternal and Fetal Factors
Fetal Diagnosis and Therapy, 06/29/2012
Ashoor G et al. – The fetal fraction in maternal plasma cell–free DNA (cfDNA) increases with serum PAPP–A and free β–hCG and decreases with maternal weight.



