Lever
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 the pituitary gland's regulation of thyroid function.
Reference Ranges
Reference
0.4–4mU/L
0.4
2.5
4
LowNormalHigh
Reference
Optimal
Unit · mU/LReference ranges may vary by age and laboratory. TSH levels can be influenced by time of day and fasting state.
Overview
Übersicht
Thyroid-Stimulating Hormone (TSH) is a pituitary hormone that regulates the production of thyroid hormones by the thyroid gland, specifically thyroxine (T4) and triiodothyronine (T3). It plays a crucial role in maintaining metabolic rate, heart function, digestive health, muscle control, brain development, and bone maintenance. Researchers have found that TSH levels are indicative of thyroid gland function and are used to diagnose and manage thyroid disorders. Elevated TSH levels often indicate hypothyroidism, where the thyroid gland is underactive, while low TSH levels can suggest hyperthyroidism, where the gland is overactive. In the context of athletic performance, biohacking, or longevity, maintaining optimal thyroid function is essential for energy metabolism, muscle function, and overall health. Researchers have observed that thyroid dysfunction can impact physical performance, recovery, and metabolic efficiency. However, TSH levels can be influenced by various factors, including time of day, fasting state, and concurrent medications. Assay interferences and physiological states such as pregnancy or critical illness can also affect TSH measurements, necessitating careful interpretation of results in clinical practice.
Klinische Bedeutung
Elevated TSH levels typically indicate primary hypothyroidism, while low TSH levels suggest hyperthyroidism. Subclinical hypothyroidism is characterized by elevated TSH with normal free thyroxine levels.
Dynamics
Trend Interpretation
Rising Values
Progressively rising TSH values suggest worsening hypothyroidism. Retest in 4-6 weeks if outside optimal range.
Falling Values
Progressively falling TSH values may indicate improving thyroid function or overtreatment with thyroid hormone.
Re-test Interval
4 weeks if outside optimal range
Etiology
Causes — High & Low
Cause
Elevated Levels
- Primary hypothyroidism
- Hashimoto's thyroiditis
- Thyroid hormone resistance
- Pituitary adenoma
- Iodine deficiency
Cause
Low Levels
- Hyperthyroidism
- Graves' disease
- Excessive thyroid hormone therapy
- Pituitary dysfunction
- Severe illness
Protocol
How to Optimize
Lever
Nutrition
- Iodine-rich foods
- Selenium-rich foods
Lever
Supplementation
- Iodine
- Selenium
Note:
Consult a healthcare provider before starting supplements, especially if on thyroid medication.
Testing Guidelines
✓Fasting Not Required
🕐Time-Sensitive
TSH levels can vary throughout the day; morning testing is recommended for consistency.
Testing Frequency
Annually for healthy adults, more frequently if managing thyroid disorders.
Interfering Factors
- Recent intense exercise
- Biotin supplementation
Related Peptides & Hormones
Thyroxine
hormoneDirectly measures
Open Research Questions
Current research suggests that age-specific reference ranges for serum TSH in older populations remain inadequately defined, particularly for those over 80 years. Researchers have not yet established the optimal TSH targets for subclinical hypothyroidism treatment, especially in elderly patients with mildly elevated levels. Additionally, clinical questions regarding the impact of TSH signaling on immune evasion in cancers, such as colorectal carcinoma, and its potential as a therapeutic biomarker remain unanswered.
19 Research Publications
884
Total Citations
2
Human/RCT
6.8
Avg. Influence
2023
Latest
Sort
Filter
01Top
#01
2013 ETA Guideline: Management of Subclinical Hypothyroidism.
ReviewInfluence22.0
308
Researchers found that subclinical hypothyroidism can be categorized based on TSH levels, with varying management recommendations for different age groups. They emphasized the importance of monitoring TSH levels and considering individual symptoms before initiating treatment. The study advocates for a careful approach in older patients.
02Top
#02
Hypothyroidism in pregnancy.
ReviewInfluence18.0
276
Researchers found that hypothyroidism affects 3-5% of pregnant women, with subclinical hypothyroidism being more common. They emphasized the importance of monitoring TSH levels during pregnancy and starting levothyroxine treatment for overt hypothyroidism promptly. The study highlights varying recommendations for managing subclinical hypothyroidism in pregnant women.
03Top
#03
Laboratory Testing in Thyroid Conditions - Pitfalls and Clinical Utility.
ReviewInfluence5.0
121
This study examined the role of various laboratory tests, including TSH, in diagnosing thyroid disorders. Researchers highlighted that TSH measurements are crucial for assessing thyroid function and diagnosing conditions like Hashimoto's thyroiditis and Graves' disease. They also discussed potential pitfalls in interpreting these tests, emphasizing the need for clinical context.
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
Local TSH/TSHR signaling promotes CD8+ T cell exhaustion and immune evasion in colorectal carcinoma.
In Vitro
29
Researchers found that TSH signaling in CD8+ T cells contributes to immune evasion in colorectal cancer. They identified that high TSH receptor expression in these cells promotes T cell exhaustion, suggesting that targeting this pathway may enhance immunotherapy responses. The study indicates a potential role for TSH as a biomarker in cancer treatment.
06
#06
Hypothyroidism.
McDermott Michael T · Annals of internal medicine · 2020
ReviewInfluence1.0
29
Researchers found that hypothyroidism is commonly diagnosed through elevated serum thyroid-stimulating hormone (TSH) levels. They noted that treatment with oral L-thyroxine is effective for overt hypothyroidism, while the benefits for subclinical hypothyroidism vary, particularly in older patients. The study emphasizes the importance of maintaining serum TSH levels within the reference range.
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.
07
#07
Thyroid-Stimulating Hormone Values in Pregnancy: Cutoff Controversy Continues?
Review
23
Researchers addressed the controversy surrounding TSH cutoff values during pregnancy, emphasizing the importance of maintaining thyroid function. They noted differing recommendations from various guidelines regarding trimester-specific TSH levels. The study highlighted the need for ongoing discussion about the management of thyroid disorders in pregnant women.
08
#08
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.
09
#09
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.
10
#10
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.
Clinical Trials (1)
1
Total Trials
60
Total Enrolled
Safety and Efficacy of Empiric Levothyroxine (LT4) Dose Increase Versus Individualized LT4 Dose Increase in Hypothyroid Women During Pregnancy
NCT03115515COMPLETED
Sponsor
Medstar Health Research Institute
Enrollment
60
Started
2011
Primary outcome
% of TSH values within trimester-specific goal range per patient from study enrollment to delivery
Pregnancy RelatedThyroid
Publication Trend
Research publications about TSH over time
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