How often could newborn screening need retested?

Newborn screen: Usually it is done twice. Day 1 & 14.

Which screening ??: Metabolic screening is usually done after 24 hours and again after a week. Further study is not indicated unless a clinical indication arised.Hearing screening is generally done at any point prior to hospital discharge and repeated until the kid passes or a decision is made for a more specific test. Hearing is also screened at any future point if a parent has concerns that the kid is not hearing.