Is there a place for the estimation of free tri-iodothyronine levels in the diagnosis of hypothyroidism?

I. Jialal, R. K. Desai, P. Naicker, S. M. Joubert

Research output: Contribution to journalArticle


In this study free thyroxine (fT4) and free tri-iodothyronine (fT3) levels were assayed in 87 patients with a clinical diagnosis of hypothyroidism who had elevated thyrotrophin (TSH) levels (> 5,5 mU/l). fT4 levels were decreased in 72 of these 87 patients. However, only 44 of the 72 patients with low fT4 levels and increased TSH levels had a decreased concentration of fT3. The remaining 28 patients had normal fT3 levels. It appears that fT3 levels have little, if any, place in screening for hypothyroidism.

Original languageEnglish (US)
Pages (from-to)805-806
Number of pages2
JournalSouth African Medical Journal
Issue number11
StatePublished - 1985
Externally publishedYes


ASJC Scopus subject areas

  • Medicine(all)

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