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 ...

There are, however, several other possible explanations for a 46,XX/46,XY karyotype at amniocentesis. These include the presence of cells from an undiagnosed twin pregnancy, cross contamination in the ...