Conditions That Increase Serum Thyroid-Stimulating Hormone Values

• Lab error

• Primary hypothyroidism

• Synthroid therapy with insufficient dose; some patients

• Lithium or amiodarone; some patients

• Hashimotoís thyroiditis in later stage; some patients

• Large doses of inorganic iodide (e.g., SSKI)

• Severe nonthyroid illness in recovery phase; some patients

• Iodine deficiency (moderate or severe)

• Addisonís disease

• TSH specimen drawn in evening (peak of diurnal variation)

• Pituitary TSH-secreting tumor

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