Lever
Lifestyle
- Regular exercise
- Adequate hydration
- Avoid smoking
Critical Thresholds
Seek immediate medical attention if hemoglobin < 7.0 g/dL due to risk of severe anemia.
Critical Low7 g/dLCritical High20 g/dL
Blutwerte · Marker
Hämoglobin
Hemoglobin · HGB · Hb
BlutbildZeitabhängig
- Einheit:
- g/dL
- Abbreviation
- Hb / HGB
Hemoglobin test quantifies the concentration of hemoglobin protein in the blood, indicating the oxygen-carrying capacity of red blood cells.
Reference Ranges
Reference
13–17g/dL
7
13
17
20
LowNormalHigh
Reference
Critical
Unit · g/dLReference ranges may vary slightly depending on the laboratory and are typically higher for males than females.
Overview
Übersicht
Hemoglobin (Hb) is a vital protein found in red blood cells responsible for transporting oxygen from the lungs to the rest of the body and returning carbon dioxide from the tissues back to the lungs. It is composed of four protein subunits, each containing an iron-bound heme group that can bind to oxygen molecules. Clinically, hemoglobin levels are crucial for diagnosing and managing various conditions, including anemia, polycythemia, and chronic diseases like kidney disease. Elevated hemoglobin levels may indicate conditions such as polycythemia vera or chronic hypoxia, while low levels are often associated with anemia, blood loss, or nutritional deficiencies. For athletes and biohackers, maintaining optimal hemoglobin levels is essential for maximizing oxygen delivery and enhancing endurance performance. However, artificially manipulating hemoglobin levels, such as through blood doping, is considered unethical and is banned in competitive sports. It's important to note that hemoglobin levels can be influenced by factors such as altitude, hydration status, and recent physical activity. Testing should ideally be done in a fasting state and at the same time of day to ensure consistency, as diurnal variations can occur. Researchers have observed that hemoglobin levels can be affected by various physiological and pathological conditions, making it a critical marker in both clinical and performance settings.
Klinische Bedeutung
Elevated hemoglobin levels may indicate polycythemia vera, chronic hypoxia, or dehydration. Reduced levels often suggest anemia, blood loss, or nutritional deficiencies such as iron, vitamin B12, or folate deficiency.
Dynamics
Trend Interpretation
Rising Values
Progressively rising hemoglobin levels may suggest polycythemia or dehydration. Re-test in 4 weeks if outside optimal range.
Falling Values
Progressively falling hemoglobin levels may indicate worsening anemia or blood loss.
Re-test Interval
4 weeks if outside optimal range
Etiology
Causes — High & Low
Cause
Elevated Levels
- Polycythemia vera
- Chronic hypoxia
- Dehydration
- High altitude living
- Anabolic steroid use
Cause
Low Levels
- Iron deficiency anemia
- Vitamin B12 deficiency
- Folate deficiency
- Chronic kidney disease
- Blood loss
Protocol
How to Optimize
Lever
Nutrition
- Iron-rich foods like red meat and spinach
- Vitamin B12 sources like eggs and dairy
- Folate-rich foods like leafy greens
Lever
Supplementation
- Iron supplements
- Vitamin B12 supplements
- Folate supplements
Note:
Consult a physician before supplementing iron, especially if not diagnosed with iron deficiency.
Testing Guidelines
✓Fasting Not Required
🕐Time-Sensitive
Hemoglobin levels can vary throughout the day; testing should be consistent in timing.
Testing Frequency
Annually for healthy adults, more frequently if managing a condition like anemia.
Interfering Factors
- Recent intense exercise
- Dehydration
- Altitude changes
Related Peptides & Hormones
Erythropoietin
hormone or peptideMay affect
Open Research Questions
Current research suggests that reference ranges for hemoglobin (HGB) may vary significantly across different populations and conditions, leading to potential misdiagnosis. Researchers have not yet established optimal HGB targets for specific patient groups, such as those with multiple myeloma or postacute sequelae of SARS-CoV-2 infection. Additionally, clinical questions remain unanswered regarding the role of HGB in predicting outcomes in various diseases and its interactions with other biomarkers in complex conditions.
22 Research Publications
851
Total Citations
11
Human/RCT
7.8
Avg. Influence
2025
Latest
Sort
Filter
01Top
#01
CLINICAL PRACTICE. Polycystic Ovary Syndrome.
Case ReportInfluence15.0
395
This study examined a 22-year-old woman with symptoms of Polycystic Ovary Syndrome (PCOS), including irregular menses and hirsutism. Researchers found elevated testosterone levels and a glycated hemoglobin level of 5.7%, indicating potential metabolic concerns associated with PCOS.
02Top
#02
Hemoglobin variants: biochemical properties and clinical correlates.
ReviewInfluence11.0
326
Researchers reviewed over 1000 naturally occurring hemoglobin variants that affect hemoglobin synthesis and function. The study highlighted the biochemical properties of these variants and their implications for hematology practice, revealing a range of physiological effects from insignificant to severe.
03Top
#03
Low hemoglobin deferral in blood donors.
ReviewInfluence2.0
54
This study examined the causes of low hemoglobin deferral in blood donors. Researchers found that low hemoglobin deferral often results from iron deficiency anemia, particularly in pre-menopausal women, complicating the understanding of anemia causes in blood donation contexts.
04
#04
Differentiation of Prior SARS-CoV-2 Infection and Postacute Sequelae by Standard Clinical Laboratory Measurements in the RECOVER Cohort.
HumanInfluence3.0
29
Researchers investigated clinical laboratory markers in participants with prior SARS-CoV-2 infection and postacute sequelae of SARS-CoV-2 infection (PASC). They found that those with prior infection had higher mean hemoglobin A1c levels compared to uninfected participants, although these differences were of modest clinical significance.
05
#05
Advances in mass spectrometric methods for detection of hemoglobin disorders.
Review
11
This review discussed advancements in mass spectrometry for detecting hemoglobin disorders. Researchers noted that these disorders, caused by mutations in hemoglobin molecules, represent a significant global health issue. The study suggests that mass spectrometry could become a first-line screening tool for hemoglobin disorders due to its enhanced clinical significance.
06
#06
The Importance of Hypoxia-Related to Hemoglobin Concentration in Breast Cancer.
Review
10
Researchers investigated the relationship between hemoglobin concentration and hypoxia in breast cancer. They found that lower hemoglobin levels are associated with poor prognosis and quality of life in breast cancer patients, highlighting the importance of monitoring hemoglobin during treatment.
07
#07
Implementing Reticulocyte Hemoglobin Into Current Hematology Algorithms.
Meta-Analysis
8
Researchers conducted a systematic review on the use of reticulocyte hemoglobin in screening for iron deficiency and iron-deficiency anemia. They found that reticulocyte hemoglobin values could effectively distinguish iron-deficiency anemia with high sensitivity and specificity.
08
#08
Laboratory Monitoring in Transgender and Gender-Diverse Individuals.
Nolan Brendan J & Cheung Ada S · Clinical chemistry · 2025
Review
6
Researchers reviewed the impact of gender-affirming hormone therapy on laboratory parameters, including hemoglobin levels. They emphasized the need for sex-specific reference ranges for hemoglobin in transgender and gender-diverse individuals receiving hormone therapy.
Key findings
- 01Researchers observed that gender-affirming hormone therapy leads to changes in laboratory parameters that are typically based on sex-specific reference ranges.
- 02The study highlights the need for clinicians to use reference ranges that correspond to an individual's affirmed gender when interpreting lab results.
- 03Key lab parameters affected include hemoglobin, renal function indicators, and cardiac biomarkers.
09
#09
Clinical and laboratory features of different types of cancer-associated thrombosis.
Human
4
This study evaluated clinical features and laboratory test results of cancer patients with venous thromboembolism (VTE). Researchers found lower hemoglobin levels in gynecological cancer patients compared to lung cancer patients, indicating differing risk factors for VTE across cancer types.
10
#10
A reassessment of hemoglobin and hematoma expansion in intracerebral hemorrhage.
Human
3
This cohort study reassessed the relationship between admission hemoglobin levels and hematoma expansion in patients with spontaneous intracerebral hemorrhage. Researchers found no significant association between hemoglobin levels and hematoma expansion, although higher hemoglobin levels were linked to better three-month outcomes. The findings suggest that other factors may mediate the relationship between hemoglobin and outcomes.
Publication Trend
Research publications about Hämoglobin over time
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