Determination of plasma B-type natriuretic peptide concentrations in the neonatal period

Determine plasma NT-ProBNP concentration in the neonatal period. Objects and methods of the study: Prospective, cross-sectional study on 96 children from 1 day to 28 days at the Vietnam National Children's Hospital. Quantifying the plasma NT-ProBP concentration and comparing between age groups, gender, and preterm – fullterm infants.