Lever
Lifestyle
- Stay hydrated
- Avoid smoking
- Manage chronic conditions like COPD
- Regular exercise
Blutwerte · Marker
Hämatokrit
Hematocrit · HCT · PCV
BlutbildZeitabhängig
- Einheit:
- L/L
- Abbreviation
- HKT / HCT
Hematocrit quantifies the percentage of blood volume that is composed of red blood cells.
Reference Ranges
Reference
0.36–0.5L/L
0.36
0.4
0.5
LowNormalHigh
Reference
Optimal
Unit · L/LRanges can vary based on age, sex, and altitude. Typically higher in males.
Overview
Übersicht
Hematocrit (HCT) is a blood biomarker that measures the proportion of blood volume occupied by red blood cells. It is a critical component of the complete blood count (CBC) and reflects the oxygen-carrying capacity of blood. Clinically, hematocrit levels are important for diagnosing and monitoring conditions such as anemia, polycythemia, and dehydration. Elevated hematocrit levels can indicate polycythemia vera, chronic obstructive pulmonary disease (COPD), or dehydration, while low levels may suggest anemia, hemorrhage, or overhydration. In the context of athletic performance and biohacking, optimal hematocrit levels are sought to enhance oxygen delivery and endurance. However, excessively high levels can increase the risk of thrombosis and cardiovascular events. Researchers have observed that hematocrit levels can be influenced by factors such as altitude, smoking, and hydration status. It is important to consider these confounders when interpreting hematocrit results, as well as the potential impact of diurnal variations and the need for fasting before testing.
Klinische Bedeutung
Elevated hematocrit levels may indicate polycythemia, dehydration, or chronic hypoxia, while reduced levels can suggest anemia, hemorrhage, or overhydration.
Dynamics
Trend Interpretation
Rising Values
Progressively rising hematocrit levels may suggest dehydration or polycythemia. Re-test in 4 weeks if outside the optimal range.
Falling Values
Progressively falling hematocrit levels may indicate anemia or blood loss.
Re-test Interval
4 weeks if outside optimal range
Etiology
Causes — High & Low
Cause
Elevated Levels
- Polycythemia vera
- Dehydration
- Chronic obstructive pulmonary disease
- Living at high altitude
- Smoking
Cause
Low Levels
- Anemia
- Hemorrhage
- Overhydration
- Chronic kidney disease
- Pregnancy
Protocol
How to Optimize
Lever
Nutrition
- Iron-rich foods
- Vitamin B12 sources
- Folic acid-rich foods
- Adequate protein intake
Lever
Supplementation
- Iron supplements
- Vitamin B12
- Folic acid
Note:
Consult a physician before starting iron supplementation, especially if not diagnosed with iron-deficiency anemia.
Testing Guidelines
✓Fasting Not Required
🕐Time-Sensitive
Hematocrit can vary slightly throughout the day; morning samples are often preferred.
Testing Frequency
Annually for healthy adults, more frequently if managing a condition affecting red blood cells.
Interfering Factors
- Recent intense exercise
- Dehydration
- Altitude changes
Related Peptides & Hormones
Erythropoietin
hormoneMay affect
Open Research Questions
Current research suggests that the optimal reference ranges for hematocrit in the context of allogeneic hematopoietic cell transplantation (HCT) and its impact on complications like graft-versus-host disease (GVHD) remain unclear. Researchers have not yet established standardized guidelines for hematocrit levels that could predict outcomes post-HCT. Additionally, clinical questions about the role of hematocrit as a biomarker for splenomegaly-related complications and its interaction with other biomarkers in HCT settings remain unanswered.
27 Research Publications
178
Total Citations
12
Human/RCT
2.0
Avg. Influence
2025
Latest
Sort
Filter
01Top
#01
Approach to Interpreting Common Laboratory Pathology Tests in Transgender Individuals.
ReviewInfluence2.0
37
This review discussed the interpretation of laboratory tests in transgender individuals undergoing hormone therapy. Researchers highlighted the need to adjust reference ranges for hematocrit and other tests based on the individual's affirmed gender to improve clinical care and outcomes.
02Top
#02
Splenomegaly in patients with primary or secondary myelofibrosis who are candidates for allogeneic hematopoietic cell transplantation: a Position Paper on behalf of the Chronic Malignancies Working Party of the EBMT.
Review
33
This study examined the impact of splenomegaly in patients with myelofibrosis undergoing allogeneic hematopoietic cell transplantation (HCT). Researchers found that significant splenic enlargement is linked to higher risks of delayed engraftment and worse survival outcomes. They emphasized the need for assessing spleen size and considering treatment options before HCT.
03Top
#03
Current Definitions and Clinical Implications of Biomarkers in Graft-versus-Host Disease.
Review
27
This review focused on the definitions and clinical implications of biomarkers for graft-versus-host disease (GVHD) after hematopoietic cell transplantation. Researchers observed that while many biomarkers have been identified, none are yet qualified for clinical use, highlighting the need for clear definitions and frameworks for their application.
04
#04
Efficacy of circulating microRNA-130b and blood routine parameters in the early diagnosis of gastric cancer.
HumanInfluence2.0
13
This study assessed the diagnostic potential of circulating microRNA-130b and blood routine parameters, including hematocrit, for gastric cancer. Researchers found that specific blood parameters differed significantly between cancer patients and healthy controls, suggesting their potential as biomarkers for early detection.
05
#05
Comparison of three-fold converted hematocrit and micro-hematocrit in pregnant women.
Human
12
In this study, researchers compared three-fold converted hematocrit with the standard micro-hematocrit method in pregnant women. They found a strong correlation between the two methods, indicating that the three-fold converted hematocrit is an acceptable alternative for diagnosing anemia during pregnancy.
06
#06
Quality specifications for the extra-analytical phase of laboratory testing: Reference intervals and decision limits.
Review
11
Researchers discussed the importance of reference intervals and decision limits in laboratory testing. They emphasized the need for gender- and age-specific reference intervals for hematocrit and other common parameters to ensure accurate clinical assessments and reduce patient risk.
07
#07
Hematological and biochemical reference intervals of wild-caught and inhouse adult Indian rhesus macaques (Macaca mulatta).
Animal
8
Researchers established reference intervals for hematological and biochemical parameters in Indian rhesus macaques. They found significant differences in hematocrit levels between wild-born and in-house animals, with wild-born macaques showing higher values, indicating the importance of source and sex in interpreting these parameters.
08
#08
PET assessment of acute gastrointestinal graft versus host disease.
Review
7
Researchers examined the potential of using PET imaging and tissue-based biomarkers for diagnosing acute gastrointestinal graft-versus-host disease (GI-GVHD). They found that these novel tools could improve early identification and management of GI-GVHD, which is associated with high morbidity and mortality.
09
#09
Laboratory Monitoring in Transgender and Gender-Diverse Individuals.
Nolan Brendan J & Cheung Ada S · Clinical chemistry · 2025
Review
7
This review discussed the impact of gender-affirming hormone therapy on laboratory parameters, including hemoglobin and hematocrit levels. Researchers found that hormone therapy alters these parameters, necessitating the use of gender-specific reference ranges for accurate interpretation.
Key findings
- 01Researchers observed that gender-affirming hormone therapy leads to changes in laboratory parameters that are typically based on sex-specific reference ranges.
- 02They found that for individuals on hormone therapy, lab results for hemoglobin, kidney function, and heart-related biomarkers should be interpreted using reference ranges that match their affirmed gender.
- 03The review emphasizes the need for clinicians to consider these changes to ensure accurate health assessments for transgender and gender-diverse patients.
10
#10
Mild macrocytosis in Williams-Beuren syndrome.
HumanInfluence2.0
7
This study evaluated the occurrence of macrocytosis in patients with Williams-Beuren syndrome. Researchers found that 35% of subjects had macrocytosis, with mean corpuscular volume values higher than expected. Despite this, anemia was absent in the majority of cases.
Publication Trend
Research publications about Hämatokrit over time
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