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Lifestyle
- Regular physical activity
- Adequate hydration
- Avoid smoking
Blutwerte · Marker
RDW
Red Cell Distribution Width · Anisozytose-Index
Blutbild
- Einheit:
- %
RDW quantifies the variation in size of red blood cells in a blood sample.
Reference Ranges
Reference
11.5–14.5%
11.5
13.5
14.5
LowNormalHigh
Reference
Optimal
Unit · %Reference ranges can vary slightly based on laboratory standards and population demographics.
Overview
Übersicht
Red Cell Distribution Width (RDW) is a measure of the variation in size or volume of red blood cells (RBCs) in a blood sample. It is calculated as part of a standard complete blood count (CBC) and is expressed as a percentage. RDW is primarily used to assess the heterogeneity of erythrocyte sizes, which can indicate various hematological disorders. Clinically, RDW is significant in diagnosing and monitoring conditions such as anemia, cardiovascular diseases, and inflammatory states. Elevated RDW levels have been associated with poor prognosis in conditions like non-small cell lung cancer, as they reflect underlying inflammation and nutritional deficiencies. In the context of athletic performance and biohacking, RDW may be relevant as it can indicate the efficiency of oxygen transport and overall erythropoietic health, which are crucial for endurance and recovery. However, RDW is influenced by several factors, including age, sex, and nutritional status, which can confound its interpretation. It is not typically sensitive to time-of-day variations or fasting status, but acute illnesses or recent blood transfusions can affect RDW values. Therefore, RDW should be interpreted in conjunction with other hematological parameters for a comprehensive assessment.
Klinische Bedeutung
Elevated RDW values may indicate anisocytosis, which is common in various types of anemia, cardiovascular diseases, and inflammatory conditions. Low RDW values are less common and generally not clinically significant.
Dynamics
Trend Interpretation
Rising Values
Progressively rising RDW values may suggest worsening anemia or inflammatory conditions. Re-test in 4 weeks if outside optimal range.
Falling Values
Falling RDW values may indicate improvement in underlying conditions such as anemia.
Re-test Interval
4 weeks if outside optimal range
Etiology
Causes — High & Low
Cause
Elevated Levels
- Iron deficiency anemia
- Vitamin B12 deficiency
- Folate deficiency
- Chronic inflammation
- Liver disease
- Cardiovascular disease
Cause
Low Levels
- Not clinically significant
- Uniform red blood cell size
- Recent blood transfusion
- Laboratory error
Protocol
How to Optimize
Lever
Nutrition
- Iron-rich foods
- Vitamin B12 supplementation
- Folate-rich foods
Lever
Supplementation
- Iron supplements
- Vitamin B12
- Folate
Note:
Consult a healthcare provider before starting supplements, especially if you have underlying health conditions.
Testing Guidelines
✓Fasting Not Required
✓Not Time-Sensitive
Testing Frequency
Annually as part of a complete blood count for routine health checks
Interfering Factors
- Recent blood transfusion
- Acute illness
- Pregnancy
Open Research Questions
Current research suggests that the reference ranges for RDW and its optimal targets in various disease contexts, such as cancer and bipolar disorder, remain debated, particularly regarding confounding factors like inflammation and nutritional status. Emerging research directions include exploring RDW's role as a biomarker for aging and its correlation with hemolysis in pediatric patients on ECMO. However, clinical questions remain unanswered regarding the mechanistic pathways linking RDW to disease progression and its utility in personalized treatment strategies.
55 Research Publications
377
Total Citations
43
Human/RCT
1.6
Avg. Influence
2025
Latest
Sort
Filter
01Top
#01
Is increased red cell distribution width (RDW) indicating the inflammation in Alzheimer's disease (AD)?
HumanInfluence2.0
66
This study assessed the relationship between red cell distribution width (RDW) and Alzheimer's disease (AD). Researchers found that RDW values were significantly higher in AD patients compared to controls, and there was a moderate negative correlation between RDW and cognitive function. Elevated RDW may indicate inflammation's role in AD pathophysiology.
02Top
#02
Utility of red cell distribution width as a diagnostic and prognostic marker in non-small cell lung cancer.
Human
27
Researchers found that RDW is significantly elevated in non-small cell lung cancer (NSCLC) patients compared to healthy individuals. The study suggests that RDW may enhance diagnostic performance and correlate with disease stage in NSCLC.
03Top
#03
The Emerging Clinical Significance of the Red Cell Distribution Width as a Biomarker in Chronic Obstructive Pulmonary Disease: A Systematic Review.
Meta-Analysis
27
This systematic review explored the role of red cell distribution width (RDW) as a biomarker in chronic obstructive pulmonary disease (COPD). Researchers found significant associations between RDW and disease presence, severity, and outcomes in both stable COPD and acute exacerbations. The findings suggest that RDW could aid in diagnosis and risk stratification for COPD patients.
04
#04
Red cell distribution width in migraine.
HumanInfluence2.0
24
This study explored the relationship between red cell distribution width (RDW) and migraine. Researchers found that RDW was significantly higher in migraine patients compared to controls and was independently associated with the condition. The study suggests that elevated RDW may correlate with migraine attack duration.
05
#05
Utility of Red Cell Distribution Width (RDW) as a Noninvasive Biomarker for the Diagnosis of Acute Appendicitis: A Systematic Review and Meta-Analysis of 5222 Cases.
Meta-Analysis
24
This systematic review and meta-analysis assessed the utility of red cell distribution width (RDW) as a diagnostic biomarker for acute appendicitis. Researchers found no statistically significant difference in RDW values between patients with acute appendicitis and healthy controls. The study concludes that RDW currently lacks utility as a diagnostic marker for appendicitis.
06
#06
Association Between Variation in Red Cell Size and Multiple Aging-Related Outcomes.
HumanInfluence1.0
24
Researchers found that greater variability in red blood cell size, indicated by RDW, is linked to increased functional limitations, frailty, and cognitive decline in older men. Higher RDW was also associated with a greater risk of falls and hospitalization. These findings suggest RDW may serve as a marker for biological aging.
07
#07
Red blood cell distribution width: A marker of anisocytosis potentially associated with atrial fibrillation.
ReviewInfluence1.0
22
This review investigated the clinical significance of red cell distribution width (RDW) in patients with atrial fibrillation (AF). Researchers found that higher RDW values are predictive of AF and associated with various complications, including hospitalization and mortality. The study suggests that RDW measurement could enhance risk assessment in AF patients.
08
#08
Association between red cell distribution width/serum albumin ratio and diabetic kidney disease.
Chen Jiaqi, et al. · Journal of diabetes · 2024
HumanInfluence1.0
21
Researchers examined the association between the red cell distribution width/serum albumin ratio (RA) and diabetic kidney disease (DKD). They found that higher RA levels were independently linked to an increased risk of DKD in diabetic patients, indicating its potential as a risk stratification tool.
Key findings
- 01Higher RA levels in diabetic patients were linked to a greater risk of developing diabetic kidney disease.
- 02The study analyzed data from over 4,500 diabetic patients across two large health databases.
- 03RA may serve as a cost-effective tool for assessing kidney disease risk in diabetes patients.
09
#09
Higher red cell distribution width and poorer hospitalization-related outcomes in elderly patients.
Human
20
This study evaluated the relationship between red cell distribution width (RDW) and hospitalization outcomes in elderly patients. Researchers observed that higher RDW values were linked to increased in-hospital mortality, higher 30-day readmission rates, and longer hospital stays, suggesting RDW as a marker for poor prognosis in older adults.
10
#10
Red Blood Cells and Human Aging: Exploring Their Biomarker Potential.
Review
14
This review explored the potential of red blood cells (RBCs) as biomarkers of aging, highlighting age-related changes in RDW. Researchers noted that increased RDW reflects underlying shifts in erythropoiesis and cellular turnover, making it a promising candidate for aging research, despite challenges in its clinical application.
Clinical Trials (8)
8
Total Trials
1,119
Total Enrolled
Effect of Pentadecanoic Acid Supplementation on Red Blood Cell Health and Biological Aging in Healthy Older Adults
Sponsor
ReCellience15, Inc
Enrollment
93
Started
2027
Primary outcome
To assess the effect of the test product (TP) at two dose levels on red blood cell (RBC) health, as measured by red blood cell distribution width (RDW), compared to placebo
Red Blood Cell HealthBiological AgingHealthy Aging
RDW and RV-PA Coupling in Acute PE
NCT07616557NOT_YET_RECRUITING
Sponsor
Assiut University
Enrollment
190
Started
2026
Primary outcome
assess the association between admission red cell distribution width (RDW) and right ventricular-pulmonary arterial coupling, measured by TAPSE/PASP ratio on transthoracic echocardiography performed within 24 hours of admission, in adults with acute PE
Pulmonary Embolism Acute
The Prognostic Role of Red Blood Cell Distribution (RDW) in Severe COVID-19 Patients
NCT07244731COMPLETED
Sponsor
Ankara University
Enrollment
146
Started
2024
Primary outcome
discharge / death
COVID - 19PrognosisICU
Red Cell Distribution Width as a Predictor for Post Operative Atrial Fibrillation After Open Heart Surgries
NCT06286111UNKNOWN
Sponsor
Ain Shams University
Enrollment
80
Started
2024
Primary outcome
Red cell distribution width as a predictor for Post-operative Atrial fibrillation after Open Heart Surgeries
Atrial FibrillationInflammatory MarkerHeart; Surgery, Heart, Functional Disturbance as Result
Assessment of Red Cell Distribution Width's Prognostic Ability in Septic Intensive Care Unit Patients
NCT06847451COMPLETED
Sponsor
Ain Shams University
Enrollment
60
Started
2024
Primary outcome
Assessment of prognostic value of Red Cell Distribution Width in septic Intensive care units patients for 28 days mortality.
Sepsis
The Effect of Biomarkers of Inflammation on Graft Function in Kidney Transplantation
NCT05753488UNKNOWN
Sponsor
Ankara City Hospital Bilkent
Enrollment
100
Started
2023
Primary outcome
RDW
Renal Transplant Failure and RejectionInflammation
Red Cell Distribution Width Versus Presepsin (Soluble CD14) as a Prognostic Marker in Critically-ill Sepsis Patients
NCT03796715COMPLETED
Sponsor
Ain Shams University
Enrollment
200
Started
2018
Primary outcome
Mortality during intensive care unit stay
Sepsis
Red Cell Distribution Width (RDW) as a Prognostic Marker in ICU
NCT02917811COMPLETED
Sponsor
Università degli Studi di Ferrara
Enrollment
250
Started
2016
Primary outcome
90-days mortality
Blood TransfusionBiochemical Marker
Publication Trend
Research publications about RDW over time
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