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Table 1 Classification of mothers according to the level of TSH, FT4I, and TPOAb

From: Evaluation of the impact of levothyroxine treatment on the psychomotor developmental status of three-year-old children born to mothers with mild thyroid impairment; Tehran Thyroid and pregnancy study: study protocol for a randomized clinical trial

Classification

TSH (mIU/L)

FT4I

TPOAb (IU/mL)

Euthyroid

0.1–2.5

1–4.5

< 50

Overt hyperthyroidism

< 0.1

> 4.5

–

SCH

< 0.1

1–4.5

–

Overt hypothyroidism

> 10

-

–

Overt hypothyroidism

> 2.5

< 1

–

SCH TPOAb−

2.5–10

1–4.5

< 50

SCH TPOAb+

2.5–10

1–4.5

> 50

  1. TPOAb thyroid peroxidase antibodies, SCH subclinical hypothyroidism