Noninvasive diagnosis of fetal anemia and fetal intravascular transfusion therapy: experiences at Siriraj Hospital.

Traditionally, when fetal hydrops are found along with certain markers indicating fetal anemia, fetal blood sampling would be performed through cordocentesis to confirm the diagnosis. This procedure, however comes with an inherent risk of losing the whole pregnancy. When anemia was verified, treatment options were limited and the prognosis was grim.