In 2020, two randomized clinical trials found that liberal RBC transfusion hemoglobin (Hb) thresholds were non-superior to restrictive thresholds for preterm infants. To determine the extent to which restrictive RBC transfusion practices are used in neonatal intensive care units (NICUs), 1143 preterm infants (median gestation age at birth, 28 weeks and 2 days; 56% male) born during a six-week window…