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Disorders of Erythrocytes

Disorders of Erythrocytes

Disorders of erythrocytes, or red blood cells (RBCs), include a range of conditions affecting their number, shape, or function.
Erythrocyte disorders can be broadly categorized into two main types: anemic and polycythemic conditions.
A low oxygen-carrying capacity of the blood due to the loss, lower production, or destruction of erythrocytes is termed anemia. Hemorrhagic anemia, for example, occurs when bleeding from an external wound or internal ulcer reduces erythrocyte counts.
On the other...

Erythropoiesis

Erythropoiesis

Red blood cells (RBCs) transport oxygen to all body tissues. These cells survive only for 120 days and then need to be replenished. Erythropoiesis is the process of RBC production. In healthy individuals, erythropoiesis ensures all tissues are amply supplied with oxygen. In addition, blood loss due to injury leads to a drop in the physiological oxygen level that will cause erythropoiesis. Any defect in erythropoiesis leads to several physiological disorders, including thalassemia, anemia,...

Factors Affecting Erythropoiesis

Factors Affecting Erythropoiesis

The cardiovascular system regulates the number of erythrocytes in the bloodstream to ensure optimal oxygen transport. It also prevents over-proliferation of these cells, which helps to maintain blood viscosity and flow rate.
Several factors influence the erythrocyte production rate, with tissue oxygen level being among the most critical. Intense exercise or high altitudes can cause tissue hypoxia, which triggers the kidneys to release more erythropoietin (EPO) into the bloodstream.
EPO then...

Lifecycle of Erythrocytes

Lifecycle of Erythrocytes

Erythrocytes, also known as red blood cells, constantly move through blood capillaries. As a result, they damage their plasma membrane due to the continuous friction. Typically, after 100 to 120 days, erythrocytes become rigid and fragile as they wear out. As they pass through small vessels in the spleen and liver, they can get trapped and break apart into fragments.
The resident phagocytic macrophages deal with these damaged cells by engulfing them and separating their globin and heme groups....

Structure and Function of Erythrocytes

Structure and Function of Erythrocytes

There are between 4.2 and 6 million erythrocytes, also known as red blood cells, in every microliter of blood. These cells are small, flattened biconcave discs with centers that are depressed.
The erythrocyte plasma membrane is associated with proteins such as spectrin, which forms a flexible cytoplasmic meshwork. This meshwork allows erythrocytes to twist, turn, become cup-shaped, and regain their biconcave shape as they pass through narrow capillaries. Additionally, erythrocytes can form...

Hemoglobin

Hemoglobin

Hemoglobin is a globular protein made up of four subunits. Two of these subunits are alpha chains, and the other two are beta chains. Each subunit contains a molecule of heme, which has an iron atom and can bind to oxygen. When an oxygen molecule binds to one heme group, it changes the shape of hemoglobin, making it easier for the other heme groups to bind oxygen as well.
When all four heme groups are bound to oxygen, the resulting molecule is called oxyhemoglobin. As a result, arterial blood...

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Related Experiment Video

Updated: Aug 6, 2025

Author Spotlight: Advancing Erythropoiesis Research - A Simplified Pipeline for Assessing Hematopoietic Stem Cell Function in Myelodysplastic Syndromes

Author Spotlight: Advancing Erythropoiesis Research - A Simplified Pipeline for Assessing Hematopoietic Stem Cell Function in Myelodysplastic Syndromes

Published on: January 10, 2025

Secondary erythrocytosis.

Rodrick Babakhanlou¹, Srdan Verstovsek¹, Naveen Pemmaraju¹

¹Department of Leukemia, the University of Texas MD Anderson Cancer Center, Houston, Texas, USA.

Expert Review of Hematology

|March 17, 2023

Summary

This summary is machine-generated.

Secondary erythrocytosis, an elevation in red blood cells due to external factors, is more common than primary erythrocytosis. This review covers its causes, diagnosis, and treatment, emphasizing management of the underlying condition.

Keywords:

Secondary erythrocytosis acquired erythrocytosis congenital erythrocytosis erythropoietin secondary polycythemia

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Area of Science:

Hematology
Internal Medicine
Pathophysiology

Background:

Erythrocytosis is defined by elevated hemoglobin and hematocrit levels.
Primary erythrocytosis involves a bone marrow defect, while secondary erythrocytosis results from external stimuli.
Secondary erythrocytosis is more prevalent and presents a broad differential diagnosis.

Approach:

This review focuses on secondary erythrocytosis.
It will cover the causes, clinical presentation, diagnostic strategies, and therapeutic interventions.
A pragmatic approach is recommended for identifying the cause.

Key Points:

Distinguishing secondary erythrocytosis from polycythemia vera (PV) can be challenging.
There is limited data on managing certain congenital and acquired conditions causing secondary erythrocytosis.
Effective management requires addressing the root cause.

Conclusions:

Secondary erythrocytosis is common and necessitates careful diagnosis.
Treatment should target the underlying etiology.
Further research is needed for specific congenital and acquired conditions.