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Blutwerte · Marker
Hämatokrit
Hematocrit · HCT · PCV
Blutbild
- 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 may vary slightly by laboratory; consider sex-specific differences.
Overview
Übersicht
Hematocrit (HCT), also known as packed cell volume (PCV), is a blood test that measures the proportion of blood volume occupied by red blood cells. It is an essential component of a complete blood count (CBC) and provides insight into the oxygen-carrying capacity of the blood. Researchers have observed that hematocrit levels are indicative of various physiological and pathological states. Clinically, hematocrit is crucial for diagnosing and monitoring conditions such as anemia, polycythemia, and dehydration. Elevated hematocrit levels may reflect conditions like polycythemia vera or chronic hypoxia, while reduced levels often indicate anemia or blood loss. In the context of athletic performance, biohacking, and longevity, hematocrit is relevant as it influences endurance and oxygen delivery to tissues. Athletes may seek to optimize hematocrit levels for enhanced performance, though this must be balanced against the risk of thrombosis. Researchers found that factors such as hydration status, altitude, and erythropoietin use can confound hematocrit measurements. Time-of-day variations are minimal, but fasting is not required for accurate assessment. Interfering factors include recent blood transfusions and high-altitude exposure.
Klinische Bedeutung
Elevated hematocrit levels can indicate polycythemia, dehydration, or chronic hypoxia, while reduced levels suggest anemia, blood loss, or overhydration.
Dynamics
Trend Interpretation
Rising Values
Progressively rising hematocrit may suggest dehydration or polycythemia. Re-test in 4 weeks if outside optimal range.
Falling Values
Progressively falling hematocrit may indicate anemia or blood loss.
Re-test Interval
4 weeks if outside optimal range
Etiology
Causes — High & Low
Cause
Elevated Levels
- Dehydration
- Polycythemia vera
- Chronic hypoxia
- High-altitude living
- Erythropoietin use
Cause
Low Levels
- Anemia
- Blood loss
- Overhydration
- Bone marrow suppression
- Chronic kidney disease
Protocol
How to Optimize
Lever
Nutrition
- Consume iron-rich foods
- Include vitamin B12 sources
- Ensure adequate folate intake
Lever
Supplementation
- Iron supplements
- Vitamin B12
- Folate
Note:
Consult a physician before starting iron supplementation, especially if not diagnosed with iron deficiency.
Testing Guidelines
✓Fasting Not Required
✓Not Time-Sensitive
Hematocrit can vary slightly throughout the day; morning samples are preferred for consistency.
Testing Frequency
Annually for routine health checks, more frequently if monitoring a known condition
Interfering Factors
- Recent blood transfusion
- High-altitude exposure
Related Peptides & Hormones
Erythropoietin
hormoneMay affect
Open Research Questions
Current research suggests that the optimal reference ranges and targets for hematocrit levels in patients undergoing hematopoietic cell transplantation (HCT) remain debated, particularly in relation to splenomegaly and its impact on outcomes. Researchers have not yet established standardized guidelines for the management of hematocrit levels in this context. Additionally, clinical questions regarding the role of hematocrit as a biomarker for graft-versus-host disease and its implications for patient management remain unanswered.
24 Research Publications
164
Total Citations
9
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
30
This study examined the impact of splenomegaly in patients with myelofibrosis undergoing hematopoietic cell transplantation (HCT). Researchers found that significant splenic enlargement is linked to higher risks of complications such as delayed engraftment and worse survival outcomes. The paper emphasizes the need for assessing spleen size and potential therapeutic interventions before HCT.
03Top
#03
Current Definitions and Clinical Implications of Biomarkers in Graft-versus-Host Disease.
Review
26
This review discussed the importance of biomarkers in managing graft-versus-host disease (GVHD) after hematopoietic cell transplantation (HCT). Researchers observed that while many biomarkers have been identified, none are yet qualified for clinical use. The paper aims to clarify definitions and applications of GVHD biomarkers to enhance clinical management.
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
This study reviewed the potential of using PET imaging and biomarker assessment for diagnosing acute gastrointestinal graft-versus-host disease (GI-GVHD). Researchers found that combining these methods could improve diagnostic accuracy and guide treatment decisions. The findings suggest a need for innovative approaches in managing GI-GVHD.
09
#09
Hemostasis and complement in allogeneic hematopoietic stem cell transplantation: clinical significance of two interactive systems.
Review
6
This review explored the interactions between hemostasis and the complement system in the context of allogeneic HCT. Researchers found that these systems can contribute to complications such as graft-versus-host disease and thrombotic microangiopathy. The study underscores the need for understanding these interactions to improve clinical outcomes after HCT.
10
#10
Laboratory Monitoring in Transgender and Gender-Diverse Individuals.
Nolan Brendan J & Cheung Ada S · Clinical chemistry · 2025
Review
5
This review addressed the impact of gender-affirming hormone therapy on laboratory parameters in transgender and gender-diverse individuals. Researchers observed that hormone therapy can alter hemoglobin and hematocrit levels, necessitating the use of gender-appropriate reference ranges. The findings emphasize the importance of tailored laboratory monitoring for this population.
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.
Publication Trend
Research publications about Hämatokrit over time
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