Table 7

Reference ranges for thyroid function tests at ages 1-4 days and 2-4 weeks [64]

Age

Free T4 (pmol/L)

Total T4 (nmol/L)

TSH (mU/L)

1-4 days

25-64

129-283

< 39

2-4 weeks

10-26

90-206

< 10

Rastogi and LaFranchi Orphanet Journal of Rare Diseases 2010 5:17   doi:10.1186/1750-1172-5-17