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Journal 6 min read

What is thyroid function?

Thyroid function refers to the endocrine system's production and regulation of thyroid hormones, primarily thyroxine (T4) and triiodothyronine (T3), which influence metabolism, growth, and development. This page summariz

peptides-pro Editorial

What is thyroid function?

Thyroid function is the collective term for the synthesis, secretion, and peripheral action of the thyroid hormones thyroxine (T4) and triiodothyronine (T3), together with the hypothalamic-pituitary-thyroid feedback loop that regulates them. The formal endocrine pathway centres on thyroid-stimulating hormone (TSH) from the anterior pituitary, which drives thyroid hormone production; T4 and T3 then act on nuclear thyroid hormone receptors to modulate gene expression in target tissues. No single sequence, formula, or molecular weight is given in the evidence for the hormones themselves; the studies below instead measure thyroid function through serum parameters such as TSH, free T4, and free T3.

The research summarised here centres on the hypothalamic-pituitary-thyroid axis and its interactions with other endocrine and metabolic pathways, including the growth hormone axis, the gonadotropin axis, and inflammatory signalling.

Research Studies

Vitamin E and thyroid function in levothyroxine-treated hypothyroidism

A clinical trial is investigating whether vitamin E supplementation, used as an adjunct to levothyroxine therapy, can reduce oxidative stress, improve antioxidant defence mechanisms, and favourably influence thyroid hormone status in patients with hypothyroidism. The stated aim is to establish an evidence-based framework for integrating targeted antioxidant therapies into standard hypothyroid management strategies [1]. This study is ongoing; no outcome data are reported in the evidence.

Enclomiphene and thyroid function in a case of atrial flutter

A case report described a 46-year-old man with a history of mitral valve repair and chronic immune thrombocytopenia who developed atrial flutter shortly after inadvertently increasing his enclomiphene dose from 25 mg daily to 50 mg daily. Laboratory evaluation at presentation showed normal thyroid function, normal cardiac biomarkers, and normal electrolytes, alongside chronic thrombocytopenia with a platelet count of 36 × 10⁹/L. Transthoracic echocardiography showed preserved left ventricular systolic function with mild aortic regurgitation [2]. The report notes that enclomiphene citrate is increasingly prescribed off-label for secondary male hypogonadism and that its cardiovascular safety profile remains poorly characterised.

Long-acting growth hormone analogs and thyroid function in children

An observational prospective monocentric study examined hormonal changes in 33 children with isolated growth hormone deficiency who started a long-acting growth hormone analogue (somatrogon; n = 16) or switched from daily recombinant human growth hormone to the same weekly analogue (n = 17). The study explored the impact of these formulations on other pituitary axes, including thyroid function [3]. The evidence does not report specific thyroid function results from this study.

Thyroid function as a biomarker in depression pharmacogenomics

A prospective, randomized, parallel-controlled trial is enrolling 220 patients with major depressive disorder to compare pharmacogenomics-guided therapy with conventional treatment over 12 weeks. A matched healthy control cohort is included for cross-sectional biomarker comparisons [4]. Thyroid function is not specified as a primary outcome in the evidence provided.

Thyroid function panel in a Chinese obesity registry

A real-world registry study plans to enrol 10,000 patients with obesity across approximately 50 medical institutions in China. Baseline assessments include a thyroid function panel comprising three items, alongside demographic data, physical examinations, multiple laboratory tests, and hepatic elasticity ultrasound. Patients receive weight-loss therapy in routine clinical practice, with data on clinic visits, adverse events, and therapeutic regimen changes collected centrally [5].

Soluble α-Klotho–FGF23 axis and thyroid function in Hashimoto's thyroiditis

A prospective case-control study aims to compare serum soluble α-Klotho and fibroblast growth factor 23 (FGF23) levels between adults with Hashimoto's thyroiditis and age- and sex-matched healthy controls, and to investigate their associations with thyroid function parameters and inflammatory markers. Hashimoto's thyroiditis is described as the most common autoimmune thyroid disease and is increasingly recognised as a condition associated with chronic low-grade systemic inflammation beyond thyroid hormone dysfunction [6].

Luteinizing hormone, hCG, and thyroid function in endocrine assessment

A study is evaluating the role of luteinizing hormone (LH) and human chorionic gonadotropin (hCG) in adult patients undergoing assessment for endocrine disorders. The background notes that LH increases substantially after menopause and may rise in some men, and that small amounts of hCG can be detected in some postmenopausal women and older men. Recent research suggests these hormones may influence bone health, body weight, kidney function, thyroid function, and adrenal gland function, though little is known about these effects [7].

Adipokines and metabolic parameters with hormone replacement in hypothyroidism

A prospective observational study is evaluating changes in serum adipokine levels—including asprosin, adipolin, omentin-1, and visfatin—together with metabolic parameters in newly diagnosed primary hypothyroid patients before and after 8 weeks of levothyroxine replacement therapy. Primary hypothyroidism is associated with metabolic disturbances including dyslipidemia, insulin resistance, adipose tissue dysfunction, and altered adipokine secretion, and the study addresses the extent to which biochemical recovery reflects metabolic improvement [8].

Thyroid function after lateral neck dissection for papillary thyroid carcinoma

A retrospective analysis of 347 patients with papillary thyroid carcinoma who underwent total thyroidectomy with lateral neck dissection compared outcomes across three progressively extensive dissection schemes, focusing on postoperative parathyroid function [9]. The evidence does not report thyroid function outcomes from this study.

Persistent TSH elevation and autoimmune adrenal insufficiency

A case report and literature review described an adolescent with autoimmune thyroiditis who had persistent elevation of thyroid-stimulating hormone despite levothyroxine therapy, which revealed autoimmune adrenal insufficiency. The report notes that patients with autoimmune thyroiditis are at increased risk for other autoimmune conditions, including autoimmune adrenal insufficiency, and that routine screening for the latter is not recommended [10].

Goserelin versus leuprolide and thyroid function

A retrospective cohort study compared goserelin and leuprolide, both gonadotropin-releasing hormone agonists used for ovarian function suppression, in premenopausal breast cancer patients receiving adjuvant endocrine therapy. The study examined whether differences in molecular structure lead to clinically meaningful differences in efficacy and safety [11]. Thyroid function is not specified as an outcome in the evidence provided.

Omentin-1, HMGB1, and thyroid function in Hashimoto thyroiditis

A study evaluated circulating levels of omentin-1, an anti-inflammatory adipokine, and high-mobility group box 1 (HMGB1), an inflammatory alarmin, in patients with Hashimoto thyroiditis. The background describes Hashimoto thyroiditis as a chronic autoimmune disease that extends beyond abnormalities in thyroid hormone levels [12].

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