Serum NT-ProBNP level has been evaluated in transient tachypnea of newborn and found compatible with the clinical progress. Urine NT-proBNP has recently been evaluated in patent ductus arterioses and found compatible with the cardiac progress. However, urine Nt-proBNP, which does not need any blood sampling and can be collected easily, has not been evaluated for respiratory distress in newborn.