While TSH - based screening will identify the most common causes , the addition of T testing is required to pick up the rarer central causes of neonatal hypothyroidism .
It is the most widely used newborn screening test worldwide .
While screening test - based screening will identify the most common causes , the addition of T testing is required to pick up the rarer central causes of neonatal hypothyroidism .
It is the most widely used newborn screening test worldwide .