What is the definition or description of: newborn screen?

A blood test: This is most likely referring to a heal stick blood test that is performed at 24-48 hours after first feeding to test for different inherited diseases some of which have a very simple treatment to avoid complications. Each stat has it's own list of diseases it screens for. Almost all include hypothyroid, sickle cell, galactosemia and more. Often referred to as the pku test since phenylketonuria.

Newborn screen defin: It's a screening for major genetics, metabolic and developmental newborn diseases with substantial variation in the number of disorders screened for in each state. In 2012 american college of genetics advocated for uniform screening panel of 29 core (primary) conditions to be included in state newborn screening panels: 20 inborn errors of metabolism, 3 hemoglobinopathies, and 6 other conditions.