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Blood Typing

Blood Typing

Understanding an individual's blood group is a critical component of transfusion medicine. It ensures compatibility in blood transfusions, organ transplants, and even during pregnancy. Determining these blood groups involves the ABO and Rh blood typing systems, utilizing specific antigens and corresponding anti-sera to identify an individual's blood type.
Antigens are protein molecules that reside on the surface of red blood cells (RBCs). The ABO and Rh blood typing systems target antigens A,...

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...

Rh Blood Group

Rh Blood Group

The Rhesus (Rh) antigen is crucial in determining blood groups and ensuring compatibility during blood transfusions.

The ABO Blood Group

The ABO Blood Group

The ABO blood group system is a critical element of transfusion medicine, essential for determining blood compatibility in transfusions and organ transplants. It is based on specific antigens, or agglutinogens, present on the surface of red blood cells (RBCs) and corresponding antibodies, or agglutinins, in the blood plasma.
Antigens in the ABO Blood Group System
Antigens are substances that can trigger an immune response, leading to the production of antibodies. In the ABO blood group system,...

Antigens Involved in Adaptive Immunity

Antigens Involved in Adaptive Immunity

An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.

Blood Types

Blood Types

Human blood is classified into different types based on the presence of antigens on the red blood cell's surface and antibodies in the plasma. Proper identification of blood type is essential for successful blood transfusion. The International Society of Blood Transfusion has identified 38 human blood types based on the surface antigens on the red blood cells. The most common types are ABO, Rh, and MNS blood types.
ABO blood group
ABO antigens are glycoproteins encoded by genes present on...

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Related Experiment Video

Updated: Jun 19, 2026

Antigens Protected Functional Red Blood Cells By The Membrane Grafting Of Compact Hyperbranched Polyglycerols

Antigens Protected Functional Red Blood Cells By The Membrane Grafting Of Compact Hyperbranched Polyglycerols

Published on: January 2, 2013

ON THE ANTIGENIC PROPERTIES OF HEMOGLOBIN.

M Heidelberger¹, K Landsteiner

¹Hospital and the Laboratories of The Rockefeller Institute for Medical Research.

The Journal of Experimental Medicine

|October 30, 2009

Summary

This summary is machine-generated.

Antibodies against crystalline oxyhemoglobin specifically target hemoglobin. This reaction confirms hemoglobin as the active substance, unaffected by its chemical modifications or species origin.

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Determining the Reactivity and Titre of Serum using a Haemagglutination Assay

Determining the Reactivity and Titre of Serum using a Haemagglutination Assay

Published on: January 29, 2010

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Last Updated: Jun 19, 2026

Antigens Protected Functional Red Blood Cells By The Membrane Grafting Of Compact Hyperbranched Polyglycerols

Antigens Protected Functional Red Blood Cells By The Membrane Grafting Of Compact Hyperbranched Polyglycerols

Published on: January 2, 2013

Determining the Reactivity and Titre of Serum using a Haemagglutination Assay

Determining the Reactivity and Titre of Serum using a Haemagglutination Assay

Published on: January 29, 2010

Area of Science:

Biochemistry
Immunology
Protein Chemistry

Background:

Antibodies are crucial tools in biological research.
Hemoglobin is a key protein in oxygen transport.
Understanding protein-antigen interactions is fundamental.

Purpose of the Study:

To investigate the specificity of antisera produced against crystalline oxyhemoglobin.
To identify the active component in the reaction between antisera and hemoglobin solutions.
To determine if hemoglobin modifications affect antigenicity.

Main Methods:

Immunization of animals with crystalline oxyhemoglobin.
Testing the reactivity of produced antisera with various hemoglobin solutions.
Assessing the effect of hemoglobin chemical modifications (methemoglobin, carbon-monoxy hemoglobin, cyanhemoglobin) on the immune response.

Main Results:

Antisera demonstrated species-specific reactions with hemoglobin solutions.
Hemoglobin was identified as the primary active substance in the precipitin reaction.
Modifications of oxyhemoglobin did not alter the immune serum's response.
Hemoglobin from different species also inhibited the precipitin reaction to varying degrees.

Conclusions:

The study confirms hemoglobin as the antigenic determinant for antisera raised against oxyhemoglobin.
The immune response is specific to the hemoglobin molecule itself, not its oxygen-bound state.
Cross-reactivity with hemoglobins from other species suggests conserved antigenic sites.