Courtesy Getty Images In pregnancies at risk of hemolytic disease of the fetus and newborn (HDFN), amniocentesis is used to identify the fetus’s genotype. Amniocentesis is a test performed for ...

Otherwise known as "saline amniocentesis," "salting out," or a "hypertonic saline" abortion, this technique is used after 16 weeks of pregnancy, when enough fluid has accumulated in the amniotic ...