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Are thyroid function tests too frequently and inappropriately requested?

E Roti¹, E Gardini, M G Magotti

¹Centro per lo Studio, Diagnosi e Cura delle Tireopatie, Università degli Studi di Parma, Italy.

Journal of Endocrinological Investigation

|April 29, 1999

Summary

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Serum TSH is the best initial test for abnormal thyroid function. Panels including T3 and FT3 are not justified, as TSH alone is cost-effective and sufficient for diagnosis.

Area of Science:

Endocrinology
Clinical Chemistry
Diagnostic Medicine

Background:

Thyroid function tests are frequently ordered, often including serum TSH and thyroid hormones.
The optimal combination of tests for evaluating thyroid function remains a subject of clinical inquiry.

Purpose of the Study:

To analyze the utilization and diagnostic yield of various thyroid function test combinations.
To provide recommendations for cost-effective thyroid function testing strategies.

Main Methods:

Retrospective analysis of 19,181 inpatient and outpatient thyroid function test requests (45,865 tests) from 1995.
Evaluation of test combinations including T4, free T4 (FT4), T3, free T3 (FT3), and TSH.
Assessment of test results to identify patterns of thyroid dysfunction.

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Main Results:

TSH+T4+T3 panels constituted 56% of requests, with normal TSH in 80.6%.
Elevated TSH was more frequent in hospitalized patients (9.7%) vs. ambulatory (7.4%).
Panels including T3 and FT3 were found to be not cost-effective, with serum TSH alone being the most appropriate initial test.

Conclusions:

Serum TSH is the most appropriate initial test for evaluating thyroid function.
FT4 is as useful as FT3 in diagnosing hyperthyroidism.
Panels including T3 and FT3 are not justified for routine thyroid function testing.