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©Copyright 2020 by Anatolian Journal of Family Medicine Available online at www.anatoljfm.org INTRODUCTION Thyroid dysfunction is very common in the population and thyroid function tests (TFT) are of the frequently requested tests within the hormone panel. Thyroid-stimulating hormone (TSH), free triiodothyronine (fT3) and free thyroxine fT4) tests are used to evaluate thyroid functions.[1] Although it may seem useful to measure both TSH and fT4 for the diagnosis of thyroid dysfunction, even small changes in fT4 levels may cause very large changes in TSH levels.[1,2] Therefore, most guidelines and algorithms propose a two-step approach (thyroid cascade) in the TFT request. In this two-step approach, after TSH measurement is performed, if the TSH result is outside the reference range, then, fT4 measurement is recommended.[3–7]

Financial Burden of Unnecessary Test Request for Thyroid Tests in Public Health Laboratory: To what extent the algorithms are used?