oa South African Medical Journal - Free thyroixine index or effective thyroxine ratio?

Volume 51, Issue 6
  • ISSN : 0256-9574
  • E-ISSN: 2078-5135



The ability of the free thyroxine index (FTI) and the effective thyroxine ratio (ETR) to distinguish abnormal from normal thyroid function is compared in a series of 422 patients; they were equally successful in detecting hyperthyroidism.

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