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Three common thyroid diagnoses

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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The three common thyroid diagnoses are:

  • primary hypothyroidism:
    • hypothyroidism due to thyroid disease
    • TSH is elevated
    • free T3 and free T4 are low

  • secondary hypothyroidism:
    • hypothyroidism due to pituitary disease
    • TSH is low or normal
    • free T3 and free T4 are low

  • hyperthyroidism:
    • TSH levels are low
    • free T3 and free T4 are high
    • T3 levels may be elevated earlier in the disease

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