Fig. 2: Graphic abstract of Stalter et al. [2] evaluating sodium supplementation in preterm infants based on urine and serum sodium levels.

Supplementation was stopped when serum sodium (Na) exceeded 144 mEq/L or at a postmenstrual age (PMA) of 38 weeks. PA postnatal age, BPD bronchopulmonary dysplasia, NEC necrotizing enterocolitis.