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Table 1 Thyroid function in relation to plasma levels of TSH and FT4

From: Evaluation of median urinary iodine concentration cut-off for defining iodine deficiency in pregnant women after a long term USI in China

Thyroid function TSH (mIU/L)a FT4 (pmol/L)b
Normal thyroid function 0.1–3 10.42–24.32
Isolated hypothyroxinemia 0.1–3 < 10.42
Subclinical hypothyroidism > 3 10.42–24.32
Clinical hypothyroidism > 3 < 10.42
Subclinical hyperthyroidism < 0.1 10.42–24.32
Clinical hyperthyroidism < 0.1 > 24.32
  1. aNormal range for TSH (mIU/L) [8]: 0.13–3.93 (T1), 0.26–3.50 (T2), and 0.42–3.85 (T3)
  2. bNormal range for FT4 (pmol/L) 10.42–24.32 pmol/L referred the value of clinical practice in Peking Union Medical College Hospital