GSTM1 and polycythemia: Although the recipient’s umbilical cord was clamped immediately, isovolemic hemodilution was performed on the first day of life because the infant had severe polycythemia (Hb 25.0 g/dL) with signs of hyperviscosity (lactatemia > 3.0 mmol/L and reduced diuresis of <0.5 mL per kg body weight per hour).