Fetal anemia was defined as hemoglobin deficit 5 SD or greater.
Anemia was defined by at least one Hb measurement < 9 g/dL.
Anemia was defined as an admission hemoglobin level <13.0 g/dl for men and <12.0 g/dl for women.
Anemia was defined as hemoglobin levels <12 g/dl in women and <13 g/dl in men [4].
Anemia was defined according to WHO criteria Hb < 13 g dl in males + Hb < 12 g dl in females.
Anemia was defined by an Hb concentration below the lower limit of the normal range for age.
Hemoglobin threshold for developing hydrops was developed from 22 RhD-alloimmunized hydropic fetuses and severe anemia was defined as Hb≤0.60 MoM.
Anemia was defined as Hb < 6 mmol/L, because these patients near the transfusion trigger and are therefore the clinically relevant anemic patients.
Anemia was defined as a hemoglobin concentration of <11g/dl.
Anemia was defined as hemoglobin of <8 g/dl and severe anemia <5 g/dl.
Anemia was defined as hemoglobin <110g/L, and severe anemia as hemoglobin <85g/L.
