Lever
Lifestyle
- Regular monitoring of iron levels
- Avoidance of unnecessary iron supplements
- Blood donation if iron overload is present
Blutwerte · Marker
Transferrinsättigung
Transferrin Saturation · TSAT · Iron Saturation
Eisen & AnämieNüchtern erforderlich
- Einheit:
- fraction
- Abbreviation
- TSAT
TSAT quantifies the percentage of transferrin that is saturated with iron in the bloodstream.
Reference Ranges
Reference
0.2–0.5fraction
0.2
0.25
0.4
0.5
LowNormalHigh
Reference
Optimal
Unit · fractionRanges may vary slightly based on laboratory standards. Fasting is recommended for accurate results.
Overview
Übersicht
Transferrin Saturation (TSAT) is a key biomarker that measures the percentage of transferrin, a blood protein, that is saturated with iron. It reflects the balance between iron availability and the body's capacity to transport it. Clinically, TSAT is crucial for diagnosing and managing iron-related disorders, such as iron deficiency anemia and hemochromatosis. Elevated TSAT levels often indicate iron overload conditions, while low levels suggest iron deficiency. For athletes and biohackers, maintaining optimal TSAT is important for ensuring adequate oxygen transport and energy metabolism, which are critical for performance and recovery. However, TSAT levels can be influenced by various factors, including inflammation, liver disease, and recent iron intake, which may confound results. Researchers have noted that fasting and consistent testing conditions are recommended to obtain accurate measurements.
Klinische Bedeutung
Elevated TSAT values suggest iron overload conditions such as hereditary hemochromatosis, while reduced values indicate iron deficiency or anemia. Monitoring TSAT helps in diagnosing and managing these conditions effectively.
Dynamics
Trend Interpretation
Rising Values
Progressively rising TSAT values suggest increasing iron overload, warranting further investigation and potential intervention. Retest in 4 weeks if outside optimal range.
Falling Values
Progressively falling TSAT values may indicate worsening iron deficiency or increased iron utilization.
Re-test Interval
4 weeks if outside optimal range
Etiology
Causes — High & Low
Cause
Elevated Levels
- Hereditary hemochromatosis
- Iron supplementation
- Liver disease
- Multiple blood transfusions
- Ineffective erythropoiesis
Cause
Low Levels
- Iron deficiency
- Chronic blood loss
- Malabsorption syndromes
- Chronic inflammation
- Pregnancy
Protocol
How to Optimize
Lever
Nutrition
- Increase intake of iron-rich foods
- Consume vitamin C-rich foods to enhance iron absorption
- Limit tea and coffee intake around meals
Lever
Supplementation
- Iron supplements for deficiency
- Vitamin C to enhance absorption
Note:
Consult a healthcare provider before starting iron supplements, especially if iron overload is suspected.
Testing Guidelines
🍽️Fasting Required
✓Not Time-Sensitive
Iron levels can fluctuate throughout the day; morning tests are preferred.
Testing Frequency
Annually for healthy adults, more frequently if managing iron-related conditions
Interfering Factors
- Recent iron supplementation
- Inflammation
- Liver disease
Related Peptides & Hormones
Hepcidin
hormone or peptideMay affect
Open Research Questions
Current research suggests that reference ranges for transferrin saturation may vary significantly based on demographic factors and underlying health conditions, complicating its interpretation. Researchers have not yet established optimal targets for transferrin saturation in diagnosing various forms of anemia, particularly in the context of inflammation or chronic disease. Additionally, clinical questions remain unanswered regarding the precise role of transferrin saturation in differentiating between hereditary and acquired forms of hyperferritinemia.
41 Research Publications
1,410
Total Citations
17
Human/RCT
3.3
Avg. Influence
2025
Latest
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01Top
#01
Iron absorption in infants: high bioavailability of breast milk iron as indicated by the extrinsic tag method of iron absorption and by the concentration of serum ferritin.
HumanInfluence3.0
331
This study compared iron absorption in infants fed breast milk versus cow milk formula. Researchers found that breast-fed infants absorbed significantly more iron, leading to better iron stores, suggesting that breast milk may reduce the risk of iron deficiency.
02Top
#02
Cirrhosis: Diagnosis and Management.
HumanInfluence13.0
212
This study explored the diagnosis and management of cirrhosis, identifying transferrin saturation as a key marker in initial evaluations. Researchers found that many patients with cirrhosis are asymptomatic until late stages, underscoring the importance of early detection through laboratory tests.
03Top
#03
Developmental changes in red blood cell counts and indices of infants after exclusion of iron deficiency by laboratory criteria and continuous iron supplementation.
HumanInfluence3.0
122
This study assessed developmental changes in red blood cell counts in infants after excluding iron deficiency. Researchers found that continuous iron supplementation maintained normal transferrin saturation and serum ferritin levels, indicating that developmental changes in red blood cells occur independently of iron intake.
04
#04
Transferrin Saturation: A Body Iron Biomarker.
Elsayed M E, et al. · Advances in clinical chemistry · 2016
ReviewInfluence8.0
122
This study examined transferrin saturation as a key biomarker for assessing body iron status. Researchers found that while TSAT is useful for detecting iron deficiency and overload, its interpretation can be complicated by inflammation. They noted that TSAT levels may be linked to significant clinical outcomes, including cardiovascular mortality.
Key findings
- 01TSAT is a key indicator of body iron status, reflecting both plasma iron and its transport protein.
- 02The test's accuracy can be affected by conditions like inflammation, leading to potential misinterpretations.
- 03There is growing evidence that TSAT levels may be associated with cardiovascular health risks.
05
#05
Diagnosing iron deficiency: Controversies and novel metrics.
ReviewInfluence5.0
71
Researchers reviewed the diagnostic challenges of iron deficiency, focusing on established markers like transferrin saturation and novel biomarkers. They found that current diagnostic tools may struggle to accurately differentiate between various anemic conditions, highlighting the need for improved methods in patient care.
06
#06
Evaluation of microcytosis.
Human
51
This study focused on the evaluation of microcytosis, identifying low transferrin saturation as a potential indicator of iron deficiency anemia. Researchers found that further testing is necessary to confirm the diagnosis and identify underlying causes.
07
#07
Hyperferritinaemia-cataract syndrome: worldwide mutations and phenotype of an increasingly diagnosed genetic disorder.
ReviewInfluence4.0
49
08
#08
Plasma ferritin concentrations: their clinical significance and relevance to patient care.
ReviewInfluence3.0
49
This study discussed the clinical significance of plasma ferritin concentrations in assessing iron status. Researchers found that while low ferritin levels indicate iron deficiency, intermediate levels are not diagnostic, emphasizing the need for additional testing in certain conditions.
09
#09
Perianal Crohn's disease.
Case Report
44
This case study described a young girl with perianal Crohn's disease, revealing low transferrin saturation and ferritin levels. Researchers noted the importance of comprehensive laboratory evaluations in diagnosing underlying conditions. The findings underscore the need for nutritional support in managing such patients.
10
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