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Table 1 Normal ranges for thyroid function tests & thyroid antibodies in infants and children

From: Association between systemic lupus erythematosus and autoimmune thyroid dysfunction in pediatric population: a single center experience

Age

Free T4*

(ng/dL)

Free T3

(pg/mL)

TSH

(mU/L)

AntiTG (AU/ml)

AntiTPO (AU/ml)

1 to 5 years

0.8 to 1.8

2.73 to 4.95

0.7 to 6.6

Normal < 4

Elevated > 4

Normal < 20

Elevated > 20

6 to 10 years

1.0 to 2.1

2.73 to 4.69

0.8 to 6.0

11 to 18 years

0.8 to 1.9

2.67 to 4.62

0.6 to 5.8

  1. T4: thyroxine; T3: triiodothyronine; TSH: thyroid-stimulating hormone; AntiTG: antithyroglobulin antibodies; AntiTPO: antithyroid peroxidase antibodies
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Italian Journal of Pediatrics

ISSN: 1824-7288

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