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A new strategy for thyroid function testing.

G Caldwell, H A Kellett, S M Gow

    Lancet (London, England)
    |May 18, 1985
    PubMed
    Summary
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    A new strategy for thyroid function testing simplifies biochemical assessment. Measuring basal thyrotropin (TSH) first can reduce unnecessary thyroid hormone tests, improving diagnostic efficiency.

    Area of Science:

    • Endocrinology
    • Clinical Biochemistry
    • Thyroidology

    Background:

    • Increasing utilization of in-vitro thyroid function tests necessitates a more rational approach to biochemical assessment.
    • Accurate diagnosis of thyroid disease relies on appropriate laboratory investigations alongside clinical evaluation.

    Purpose of the Study:

    • To rationalize the biochemical assessment of patients with suspected thyroid disease.
    • To reduce the number of in-vitro thyroid function tests without compromising diagnostic accuracy or timeliness.

    Main Methods:

    • Clinical examination of 285 new thyroid clinic referrals.
    • Measurement of serum total and free triiodothyronine (T3) and thyroxine (T4).
    • Radioimmunoassay for thyrotropin (TSH) before and after thyrotropin-releasing hormone (TRH) stimulation.

    Related Experiment Videos

  • Immunoradiometric assay (IRMA) for basal TSH.

    • Main Results:

    • A detectable and normal basal TSH (IRMA) reliably indicates a euthyroid state, negating the need for thyroid hormone measurements.
    • Abnormal basal TSH levels (raised or undetectable) warrant further investigation with free T4 and occasionally free T3.
    • This approach effectively distinguishes between subclinical and overt hypothyroidism and hyperthyroidism.

    Conclusions:

    • Implementing a strategy prioritizing basal TSH (IRMA) measurement significantly reduces the volume of in-vitro thyroid function tests.
    • This streamlined diagnostic pathway maintains diagnostic accuracy and avoids delays in patient care.
    • The proposed rationalization enhances efficiency in managing patients with suspected thyroid dysfunction.