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Optimal thyrotropin level: normal ranges and reference intervals are not equivalent.
Richard A Dickey1, Leonard Wartofsky, Stanley Feld
1mdrad@charter.net
Thyroid : Official Journal of the American Thyroid Association
|September 29, 2005
Summary
This study advocates for a narrower thyroid-stimulating hormone (TSH) normal range of 0.4-2.5 mIU/L. This optimal range is based on clinical data and aims to improve physician interpretation of TSH test results.
Area of Science:
- Endocrinology
- Clinical Chemistry
Background:
- Thyroid-stimulating hormone (TSH) is a key indicator of thyroid function.
- Current TSH reference ranges vary, potentially leading to misdiagnosis.
- Establishing an optimal TSH range is crucial for accurate thyroid disorder diagnosis.
Purpose of the Study:
- To present evidence supporting a narrower, optimal normal range for TSH (0.4–2.5 mIU/L).
- To clarify terminology surrounding TSH results for better clinical interpretation.
- To aid physicians in explaining and responding to patient TSH test results.
Main Methods:
- Review of clinical results and recent scientific literature.
- Analysis of TSH values in individuals without thyroid disease.
- Evaluation of TSH stability and range in healthy populations.
Main Results:
- Evidence suggests a stable and narrow TSH range in euthyroid individuals.
- A proposed optimal TSH normal range is 0.4 to 2.5 mIU/L.
- Clarification of TSH terminology is provided to aid clinical practice.
Conclusions:
- A narrower TSH range (0.4–2.5 mIU/L) is proposed as optimal.
- Improved understanding and application of TSH testing can enhance patient care.
- Standardizing TSH interpretation is essential for accurate thyroid disease management.