factitious thyrotoxicosis

Factitious hyperthyroidism Falsely elevated thyroid hormones due to intake of exogenous thyroid hormones Lab ↑ total T₄, T₃ resin uptake, free T₄; ↓¹³¹I–RAIU by the thyroid. Cf Thyrotoxicosis.

References in periodicals archive ?

In 2008, Poon et al reported 3 patients found with factitious thyrotoxicosis secondary to herbal supplements for weight loss (40).

Thyroid dysfunction in an adult female population: a population-based study of Latin American vertebral osteoporosis study (LAVOS)--Puerto Rico site

In the differential diagnosis of recurrent thyrotoxicosis apart from silent thyroiditis, Hashimoto's thyroiditis, subacute thyroiditis, postpartum thyroiditis (1,4), and factitious thyrotoxicosis should be included.

Recurrence of thyrotoxicosis and the profession of the patient brings to mind factitious thyrotoxicosis which will also cause low uptake on thyroid scan, but in these cases, thyroglobulin levels will either be low or undetectable (10).