Hematocrit is the percentage of red blood cells in your blood. It’s a critical measure of how well your body is equipped to transport oxygen to cells. Blood comprises red blood cells, white blood cells, platelets, and plasma, with red cells typically making up about 45% of the volume. The exact percentage can vary depending on individual factors such as age, gender, and overall health.
Hematocrit levels are essential for assessing your body’s oxygen-carrying capacity. Red blood cells contain hemoglobin, a protein that binds to oxygen in your lungs and delivers it to tissues throughout your body. They also transport carbon dioxide back to your lungs for exhalation. Sufficient red blood cell levels are vital for energy, cell function, and overall survival.
Abnormal levels may indicate underlying health issues:
Anemia Symptoms:
Polycythemia Symptoms:
Erythrocytosis Symptoms:
Hematocrit testing is often part of a Complete Blood Count (CBC) and may be performed alongside a hemoglobin test. It helps to:
While both tests assess red blood cells, they measure different components:
The word "hematocrit" comes from the Ancient Greek words haima (blood) and krites (judge). It literally means "to separate blood," referring to the process of determining the red cell percentage in blood samples.
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When hematocrit levels are elevated, it’s essential to evaluate other connected biomarkers, such as red blood cell (RBC) count and hemoglobin levels. A combination of high hematocrit, high RBC count, and high hemoglobin typically indicates polycythemia.
Polycythemia (also known as polycythaemia or polyglobulia) is a condition where the proportion of blood volume occupied by red blood cells increases, potentially thickening the blood and affecting circulation.
Dehydration (Most Common Cause)
Living at High Altitudes
Smoking
Lung (Pulmonary) Disease
Congenital Heart Disease
Genetic Causes
Kidney Tumors
Polycythemia Vera (Rare)
Elevated hematocrit levels are often part of a broader pattern involving RBC count and hemoglobin. Identifying these connections helps distinguish between causes like dehydration, environmental factors, or serious underlying conditions like polycythemia vera.
If you notice high hematocrit levels or experience related symptoms, consult your healthcare provider for appropriate testing and diagnosis to determine the cause and guide treatment.
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When analyzing hematocrit levels, it’s essential to look at connected biomarkers like red blood cell (RBC) count and hemoglobin levels. A combination of low hematocrit, low RBC count, and low hemoglobin often indicates anemia.
Anemia is characterized by a reduction in RBCs or hemoglobin, leading to a diminished ability of the blood to carry oxygen. This condition can manifest as fatigue, shortness of breath, and other related symptoms.
Nutritional Deficiencies
Chronic Inflammatory Diseases or Conditions
Long-term inflammation can interfere with red blood cell production and lifespan.
Excessive Blood Loss
Bone Marrow Damage or Disorders
Kidney Failure
Severe or chronic kidney disease reduces erythropoietin production, a hormone that stimulates RBC production in the bone marrow.
Decreased Hemoglobin Production
Conditions like thalassemia lead to reduced hemoglobin production, impacting oxygen transport.
Excessive Red Blood Cell Destruction
Low hematocrit levels are rarely isolated. They often signal broader underlying health issues. Examining associated biomarkers such as RBC count, hemoglobin, and erythropoietin levels provides a clearer picture of the cause and guides targeted treatment options.
If you suspect low hematocrit or related symptoms, consult your healthcare provider for comprehensive testing and evaluation.
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Unlimited Plan Member since 2021
I have been using Healthmatters.io since 2021. I travel all over the world and use different doctors and health facilities. This site has allowed me to consolidate all my various test results over 14 years in one place. And every doctor that I show this to has been impressed. Because with any health professional I talk to, I can pull up historical results in seconds. It is invaluable. Even going back to the same doctor, they usually do not have the historical results from their facility in a graph format. That has been very helpful.
Karin
Advanced Plan Member since 2020
What fantastic service and great, easy-to-follow layouts! I love your website; it makes it so helpful to see patterns in my health data. It's truly a pleasure to use. I only wish the NHS was as organized and quick as Healthmatters.io. You've set a new standard for health tracking!
Paul
Healthmatters Pro Member since 2024
As a PRO member and medical practitioner, Healthmatters.io has been an invaluable tool for tracking my clients' data. The layout is intuitive, making it easy to monitor trends and spot patterns over time. The ability to customize reports and charts helps me present information clearly to my clients, improving communication and outcomes. It's streamlined my workflow, saving me time and providing insights at a glance. Highly recommended for any practitioner looking for a comprehensive and user-friendly solution to track patient labs!
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Haemoglobin (g/L), Hematocrit (Female range), Hematocrit (HCT) / Packed Cell Volume (PCV), Hemoglobin, Hemoglobin (Female range), Immature Grans (Abs), Immature Granulocytes (%), Mean Cell Volume, Mean Corpuscular Hemoglobin (MCH), Mean Corpuscular Hemoglobin Concentration (MCHC), Mean Corpuscular Volume (MCV), Mean Platelet Volume (MPV), Mean RBC Iron, Mean RBC Iron Concentration, Mean RBC Volume, MXD #, MXD %, Platelet count / Platelets, Platelet Distribution Width (PDW), Platelet-large cell ratio (P-LCR), RBC (Female range), RBC Distribution Width, RDW-CV (Red Cell Distribution Width) in %, RDW-SD (Red Cell Distribution Width) in fL, Red Blood Cells (Erythrocytes / RBC), White blood cells (Leukocytes / WBC)
