Thyrotropin Isoforms: Implications for Thyrotropin Analysis and Clinical Practice
Open accessAbstract
Serum thyrotropin (TSH) is considered the single most sensitive and specific measure of thyroid function in the general population owing to its negative logarithmic association with free triiodothyronine and free thyroxine concentrations. It is therefore often the test of choice for screening, diagnosis, and monitoring of primary hypothyroidism. Serum TSH concentrations can be analyzed quantitatively using third-generation immunoassays, whereas its bioactivity can be measured by TSH activity assays in cell culture. Theoretically, if serum TSH concentrations are directly related to TSH activity, the two tests should yield comparable results. However, on occasion, the results are discordant, with serum concentrations being higher than TSH biological activity. This review focuses on the dissociation between the clinical state and serum TSH concentrations and addresses clinically important aspects of TSH analysis.
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The immunoreactivity of TSH may be affected by changes in glycosylation state such that immunoreactive TSH concentration may not reflect bioactivity at the thyroidal TSH receptor.
“As well as these analytical issues, as previously discussed, the immunoreactivity of TSH may be affected by changes in glycosylation state such that the immunoreactive TSH concentration may not reflect bioactivity at the thyroidal TSH receptor.122–124”
While negative thyroid hormone feedback mitigates overproduction and hyperthyroidism, TRH is a potent defensive mechanism against undersupply, stimulating both pituitary TSH secretion and modulating its bioactivity.
“While negative thyroid hormone feedback mitigates thyroid hormone overproduction and hyperthyroidism, TRH is a potent defensive mechanism against undersupply, stimulating both pituitary TSH secretion and modulating its bioactivity (68–72).”
From Homeostatic control of the thyroid-pituitary axis: perspectives for diagnosis and treatment (2015) · cites this paper as [72]
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Ehrenkranz, J., Bach, P. R., Snow, G. L., Schneider, A., Lee, J. L., Ilstrup, S., Bennett, S. T., & Benvenga, S. (2015) · Thyroid · doi:10.1089/thy.2014.0589 · Cited by 190 · see citing works
“The circadian variation in TSH is absent in infants younger than one month old (25) and in patients with Shee-han’s syndrome (26).”
Homeostatic control of the thyroid-pituitary axis: perspectives for diagnosis and treatment
Hoermann, R., Midgley, J. E. M., Larisch, R., & Dietrich, J. W. (2015) · Frontiers in Endocrinology · doi:10.3389/fendo.2015.00177 · Cited by 143 · see citing works
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“Lastly, another explanation for changes during aging is a change in TSH bioactivity (52), which was not measured in our study.”
Recent advances in central congenital hypothyroidism
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“Notably, circulating TSH exists in several different isoforms with varying degrees of glycosylation, sialylation, and sulfonation which affect tissue availability and bioactivity [10,11]; this is not reflected in immunoreactive TSH concentrations determined by routine laboratory assays.”
BackgroundReporting Thyroid Function Tests in Pregnancy.
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“[25] Estrada JM, Soldin D, Buckey TM, et al.”
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“In such situations, TSH levation without increased FT4/FT3 ratio may indicate decreased SH activity [41].”
BackgroundMass spectrometry in the diagnosis of thyroid disease and in the study of thyroid hormone metabolism
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Hypothalamic-Pituitary-Thyroid Axis Perturbations in Male Mice by CNS-Penetrating Thyromimetics
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Is an Isolated TSH Elevation in Chronic Nonthyroidal Illness “Subclinical Hypothyroidism”?
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“What is the underlying etiology of isolated TSH elevations? Do elevated TSH levels represent bioactive TSH? TSH concentrations are currently measured using third-generation immunoassays, which may reflect increased immunoactive but not bioactive TSH, as in the elderly (28).”
BackgroundInfluentialHuman adaptative behavior to Antarctic conditions: A review of physiological aspects
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Subclinical Hypothyroidism: is it Really Subclinical with Aging?
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“Elevated TSH level which is not on line with T3 and T4 levels together with hCS could be indicative of reduced bioactivity of TSH (22, 25, 41).”
BackgroundMardanian, F., Goodarzi-Khoigani, M., Mahmoodabad, S. S. M., Moghadam, M. H. B., Nadjarzadeh, A., Feizi, A., Allameh, Z. S., & Molavi, S. (2021) · Journal of Research in Medical Sciences · doi:10.4103/jrms.jrms_780_20 · Cited by 9 · see citing works
“[9] The asparagine is part of the structure of TSH which regulates communication with other hormones.[10] Vitamin A activates gene that regulates TSH, and folic acid concentrations have been linked to levels of TSH.”
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“Therefore, TSH levels within the reference range may still be indicative of abnormal thyroid function in the context of thyroid cancer [51].”
BackgroundLaboratory Testing in Thyroid Disorders
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Effect of Magnesium Oxide and Zinc Oxide Nanoparticles on Triiodothyronine Hormone
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“They bind to specific receptors in cell nuclei and change the expression of certain genes[6-7].”
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Effect of Flaxseed on some hormonal profile and genomic DNA concentration in Karadi lambs
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“This is an example of a negative feedback loop [48].”
BackgroundMass spectrometry in measurement of thyroid biomarkers
Zhao, Q., Song, D., Ju, H., Xing, W., Ma, J., & Xiao, P. (2024) · Clinica Chimica Acta · doi:10.1016/j.cca.2024.119872 · Cited by 5 · see citing works
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“Thyrotropin-Releasing Factor (TRH) stimulates pituitary Thyroid Stimulating hormone (TSH) release, which triggers TH synthesis (Estrada et al., 2014; Fekete and Lechan, 2014) within thyroid follicles.”
BackgroundKülz, M., Fellner, S., Rocktäschel, J., Ceglarek, U., Willenberg, A., & Kratzsch, J. (2022) · Clinical Chemistry and Laboratory Medicine (CCLM) · doi:10.1515/cclm-2021-1211 · Cited by 5 · see citing works
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“Similar to PT-TSH, the increased sialylation is associated with decreased elimination of the molecule [61].”
BackgroundThe interference of anti-TSH autoantibody on clinical TSH detection
Tang, M., Meng, X., Ni, J., Liu, X., Wang, X., Li, Y., Chai, Y., Kou, C., Zhang, L., & Zhang, H. (2024) · Frontiers in Endocrinology · doi:10.3389/fendo.2024.1289923 · Cited by 4 · see citing works
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Shpakov, A. O. (2023) · Журнал эволюционной биохимии и физиологии · doi:10.31857/s0044452923070021 · Cited by 2 · see citing works
Shpakov, A. O., & Derkach, K. V. (2025) · Journal of Evolutionary Biochemistry and Physiology · doi:10.1134/s0022093025050011 · Cited by 1 · see citing works
“Deglycosylated TSH forms are unable to activate the TSHR and function as antagonists that inhibit signal(cid:2) ing generated by normally N-glycosylated PD-TSH [13].”
The study of thyroid profile in abnormal uterine bleeding at tertiary care center, Rajasthan, India
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“[9,11,12] Typically, macro‑TSH presents with very high TSH levels, often exceeding 100 mIU/L, prompting clinicians to initiate LT4 therapy.”
Thyroid Function in Healthy Ageing and Longevity
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“Our data, however, indicate that at least one of the Abbott or Roche TSH assays is not ‘blind’ to the pituitary TSH isoforms when compared to circulating TSH.”
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3 Thyroid Physiology and Thyroid Function Testing
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Thyroid Function Tests That Do Not Make Sense
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Biochemical Diagnosis of Thyroid Dysfunctions
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Development and validation of long-acting recombinant human TSH using SAFA technology
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“…TSH: somatostatin is also produced in the hypothalamus and has an opposite function on TSH production in the pituitary, decreasing its release [21]. decreasing its release [21] That is, when the concentration of thyroid hormones (T 3 and T 4 ) is low in the blood, TSH production is increased;…”
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- Authors
- Estrada, J. M., Soldin, D., Buckey, T. M., Burman, K. D., & Soldin, O. P.
- Affiliations
- Georgetown University Medical Center (US)
- MedStar Washington Hospital Center (US)
- Corresponding author
- Soldin, Offie P.
- Venue
- Thyroid®
- Publisher
- SAGE Publications
- Published
- 2014-03
- Volume
- 24
- Issue
- 3
- Pages
- 411-423
- ISSN
- 1050-7256 (ISSN-L)
- 1557-9077
- PMC
- PMC3949435
- OpenAlex
- W2178118369
- Cited by
- 64
- References
- 151
- Citations by year
- 2026: 1 · 2025: 7 · 2024: 5 · 2023: 7 · 2022: 5 · 2021: 6 · 2020: 5 · 2019: 6 · 2018: 5 · 2017: 5 · 2016: 2 · 2015: 5 · 2014: 4 · 2013: 1
- FWCI
- 0.59
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Thyroid (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institutes of Health
- National Institute on Aging (NIHR01AG033867)
- National Cancer Institute (P30CA051008)
- Topics
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Disorders and Treatments
- Health Sciences › Medicine › Physiology › Clinical Laboratory Practices and Quality Control
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Cancer Diagnosis and Treatment
- Keywords
- thyroid-stimulating hormone, TSH immunoassay, primary hypothyroidism, thyroid function tests, free triiodothyronine, free thyroxine, TSH receptor
- MeSH terms
- Humans, Hypothyroidism, Immunoassay, Thyroid Function Tests, Thyrotropin, Protein Isoforms
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