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Lifestyle
- Regular exercise
- Stress management
- Adequate sleep
Blutwerte · Marker
TSH
Thyreoidea-stimulierendes Hormon · Thyroid-Stimulating Hormone · Thyrotropin
Hormone — SchilddrüseZeitabhängig
- Einheit:
- mU/L
TSH quantifies the level of thyroid-stimulating hormone in the blood, reflecting pituitary gland activity and thyroid function.
Reference Ranges
Reference
0.4–4mU/L
0.4
2.5
4
LowNormalHigh
Reference
Optimal
Unit · mU/LReference ranges may vary with age and pregnancy status.
Overview
Übersicht
Thyroid-stimulating hormone (TSH), also known as thyrotropin, is a glycoprotein hormone secreted by the anterior pituitary gland. It plays a crucial role in regulating the endocrine function of the thyroid gland by stimulating the production and release of thyroid hormones, thyroxine (T4) and triiodothyronine (T3). Researchers have found that TSH levels are tightly regulated by the hypothalamic-pituitary-thyroid axis through negative feedback mechanisms. Clinically, TSH is a primary marker for assessing thyroid function. Elevated TSH levels typically indicate hypothyroidism, where the thyroid gland is underactive, while suppressed TSH levels suggest hyperthyroidism, where the thyroid is overactive. Subclinical forms of these conditions are also identified through TSH measurements, with normal T4 and T3 levels. For athletes and biohackers, maintaining optimal thyroid function is essential for energy metabolism, thermoregulation, and overall performance. Researchers observed that thyroid hormones influence basal metabolic rate and protein synthesis, impacting muscle strength and endurance. However, TSH levels can be influenced by various factors such as stress, illness, and medication, which may confound results. Time of day and fasting status can also affect TSH measurements, with levels typically peaking at night and being lowest in the afternoon. Therefore, consistent testing conditions are recommended for accurate interpretation.
Klinische Bedeutung
Elevated TSH levels indicate primary hypothyroidism, while low TSH levels suggest hyperthyroidism. Subclinical conditions are diagnosed when TSH is abnormal but T4 and T3 are normal.
Dynamics
Trend Interpretation
Rising Values
Progressively rising TSH levels suggest worsening hypothyroidism. Retest every 4-6 weeks if outside the optimal range.
Falling Values
Progressively falling TSH levels may indicate improving thyroid function or overtreatment with thyroid hormone.
Re-test Interval
4-6 weeks if outside optimal range
Etiology
Causes — High & Low
Cause
Elevated Levels
- Hashimoto's thyroiditis
- Iodine deficiency
- Thyroidectomy
- Pituitary adenoma
- Certain medications
Cause
Low Levels
- Graves' disease
- Excessive thyroid hormone therapy
- Pituitary dysfunction
- Pregnancy
- Acute illness
Protocol
How to Optimize
Lever
Nutrition
- Iodine-rich foods
- Selenium-rich foods
Lever
Supplementation
- Iodine
- Selenium
Note:
Consult a healthcare provider before starting any supplementation, especially if thyroid disease is suspected.
Testing Guidelines
✓Fasting Not Required
🕐Time-Sensitive
TSH levels are highest at night; testing should be consistent in timing.
Testing Frequency
Annually for healthy adults, more frequently if thyroid disease is present.
Interfering Factors
- Biotin supplementation
- Recent illness
- Stress
Related Peptides & Hormones
Thyroxine
hormoneCorrelated with
Open Research Questions
Current research suggests that the optimal TSH reference ranges, particularly in older populations, remain debated, as well as the appropriate management strategies for subclinical hypothyroidism. Researchers have not yet established the full impact of confounders such as concurrent medications and physiological states on TSH levels. Additionally, clinical questions regarding the long-term outcomes of TSH-targeted therapies in various populations and the role of TSH in immune responses in cancer remain unanswered.
18 Research Publications
844
Total Citations
1
Human/RCT
6.5
Avg. Influence
2023
Latest
Sort
Filter
01Top
#01
2013 ETA Guideline: Management of Subclinical Hypothyroidism.
ReviewInfluence20.0
300
Researchers reviewed the management of subclinical hypothyroidism, categorizing it based on TSH levels. They found that younger patients with significantly elevated TSH levels may benefit from L-thyroxine therapy, while older patients should be monitored. The study emphasizes the need for individualized treatment approaches.
02Top
#02
Hypothyroidism in pregnancy.
ReviewInfluence18.0
274
This study focused on hypothyroidism during pregnancy, noting that it affects 3-5% of pregnant women. Researchers highlighted the differences in definitions for subclinical and overt hypothyroidism and the need for careful management of thyroid hormone levels during pregnancy.
03Top
#03
Laboratory Testing in Thyroid Conditions - Pitfalls and Clinical Utility.
ReviewInfluence5.0
117
Researchers discussed the importance of laboratory testing in thyroid disorders, emphasizing TSH as a key diagnostic tool. They noted that thyroid function tests must be interpreted carefully to avoid misdiagnosis. The study also highlighted potential pitfalls in testing, particularly in special populations such as pregnant women.
04
#04
Biochemical Testing in Thyroid Disorders.
ReviewInfluence2.0
36
Researchers summarized the principles of laboratory testing in thyroid disorders, emphasizing the role of TSH measurement. They found that appropriate testing is crucial for early diagnosis and effective management of thyroid conditions.
05
#05
Hypothyroidism.
McDermott Michael T · Annals of internal medicine · 2020
ReviewInfluence1.0
29
This study examined hypothyroidism, a condition where the thyroid gland does not produce enough hormones. Researchers found that elevated TSH levels are indicative of primary hypothyroidism, and treatment with oral L-thyroxine is effective. The study highlights the importance of monitoring TSH levels to manage symptoms and maintain hormone balance.
Key findings
- 01Researchers found that Hashimoto thyroiditis is the most common cause of hypothyroidism in adults.
- 02Researchers observed that elevated TSH levels are a key indicator of primary hypothyroidism.
- 03Researchers noted that treatment is essential for severe cases, but mild cases may not require treatment, particularly in older patients.
06
#06
Local TSH/TSHR signaling promotes CD8+ T cell exhaustion and immune evasion in colorectal carcinoma.
Animal
26
This study investigated the role of TSH signaling in CD8+ T cell exhaustion in colorectal cancer. Researchers found that TSHR expression in CD8+ T cells contributes to immune evasion in tumors. The findings suggest that TSHR could serve as a biomarker for predicting immunotherapy responses.
07
#07
Update on subclinical thyroid dysfunction.
ReviewInfluence3.0
22
Researchers investigated subclinical thyroid dysfunction, which is characterized by abnormal TSH levels with normal thyroxine concentrations. They emphasized the importance of accurate TSH evaluation and the need for harmonization of TSH testing globally.
08
#08
Laboratory interference in the thyroid function test.
ReviewInfluence2.0
18
This study discussed laboratory interferences in thyroid function tests, particularly TSH measurements. Researchers found that various factors, including antibodies and medications, can lead to inconsistent test results, emphasizing the need for careful interpretation.
09
#09
Standardisation and harmonisation of thyroid-stimulating hormone measurements: historical, current, and future perspectives.
Review
9
Researchers discussed the historical and current challenges in standardizing TSH measurements across different assays. They noted the development of a new reference panel aimed at improving assay harmonization. The study emphasizes the importance of consistent TSH measurement for accurate diagnosis and management of thyroid disorders.
10
#10
Towards Personalized TSH Reference Ranges: A Genetic and Population-Based Approach in Three Independent Cohorts.
Human
8
This research explored the potential for personalized TSH reference ranges based on genetic factors. Researchers found that genetic profiles significantly influence TSH levels and could lead to better diagnosis and treatment decisions compared to standard population-based reference ranges.
Publication Trend
Research publications about TSH over time
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