About Blood Types/Blood Groups and Blood Group Test

I have come up with a new article. This article is going to be very informative for all of you. In today’s article I am going to explain blood types and a brief description of blood. Since I’ve covered blood in detail in my previous article, I won’t go into it in detail. If you want to read it, you can read my previous article: Description of Blood and Its Components

About blood and its composition :

Blood is a bodily fluid that flows throughout the body. It connects organs and tissues by transporting oxygen, nutrients, hormones, and waste products. The study of blood is called hematology. The four main components of blood are plasma, red blood cells, white blood cells, and platelets.

Plasma is the liquid part of blood, which makes up the majority of blood volume. Blood is composed of approximately 55% plasma and 45% red blood cells (RBCs), white blood cells (WBCs), and platelets. All of these blood cells play important roles in transport, protection, and regulation.

Let’s understand about blood types

What are the blood types/blood groups?

Austrian biologist Karl Landsteiner discovered human blood groups A, B, and O in 1901 and AB blood group was discovered by A. Decastello and Sturli B. Karl in 1902. So, there are four main blood types: A, B, AB, and O. Blood types or blood groups are determined by the presence or absence of specific antigens A and B on red blood cells. These antigens and the Rh factor, classify blood into different groups, such as A, B, AB, O (as I mentioned) and Rh-positive or Rh-negative.

Blood group A – has A antigens on the red blood cells with anti-B antibodies in the plasma. blood group B – has B antigens with anti-A antibodies in the plasma. blood group O – has no antigens, but both anti-A and anti-B antibodies in the plasma. blood group AB – has both A and B antigens, but no antibodies.

You might be wondering what is Rh factor and antigen?

Let’s understand:

1) Rh factor- The Rh factor or RhD antigen is a protein present on the surface of red blood cells. Let’s understand what it actually means.If this protein or Rh factor is present in a person’s blood, he or she will be Rh positive. On the other hand, if a person’s blood doesn’t contain this protein, or the Rh factor, he or she will be Rh negative.

Hence, there are eight common blood types: A+, A-, B+, B-, AB+, AB-, O+, and O-. These are derived from two main systems of blood classification: the ABO system and the Rh factor system.

2) Antigens- Antigens are present on the surface of red blood cells (RBCs). These antigens are made of proteins and carbohydrates and helps in determining the blood group/blood type of a person. They are important for blood transfusions and immune responses.

What is ABO system?

The ABO system is a classification used to group human blood into four types: A, B, AB, and O, based on the presence or absence of A and B antigens on the surface of red blood cells (as I have mentioned above).

What is Rh factor system?

The Rh factor system is a classification of blood based on a protein (RhD antigen) on the surface of red blood cells.

How can we determine the blood group?

I am going to tell you about a test by which we can determine our blood group. You can also do this experiment at home.

Materials required for the experiment: Materials like glass slide, blood group test kit, toothpick, lancet, sterile cotton balls are required to do this blood group test. If you are doing this experiment for someone else then it is very important to wear gloves while doing this experiment.

Blood group test kit contains tubes of three different reagents- Anti-A, Anti-B, and Anti-D(Antisera). The blue coloured tube contains Anti-A agent, the yellow coloured tube contains Anti-B reagent and the transparent tube contains Anti-D reagent.

So, let’s start the experiment:

1.  Take a clean glass slide and mark it with a marker – A, B & D. Clean your finger thoroughly with sterile cotton balls.
2. For testing, draw blood by pricking the skin with a lancet. Remove the first drop of blood to avoid contamination and extra muscular fluid.
3. Put a drop of blood where we have made marks A, B and D on the glass slide.
4. Add one drop of anti-A to the blood marked ‘A’. Add one drop of anti-B to the blood marked ‘B’. Add one drop of anti-D to the blood marked ‘D’. Do not delay it for too long as it will cause blood clots and the results will not be accurate.
5. Take three separate tooth picks to mix the blood and reagent. You can use one slide like I did, or you can use separate slides, depending on your preference.
6. Rotate the slide a little and observe, you will see agglutination.

What is Agglutination?

Agglutination means the clumping together of red blood cells, which occurs when specific antibodies bind to antigens on the cell surface. Agglutination is a key principle in many diagnostic tests, such as determining a person’s blood type, because it indicates the reaction between an antibody and its corresponding antigen.

What does the result of the experiment show?

The result will tell the person’s blood group. Let us understand how. Agglutination in A and B will indicate the blood groups and agglutination in D will tell whether the blood group is positive or negative.

1. If agglutination occurs in A but not in B and D, the blood group will be A-. If agglutination occurs in B and D but not in A, the blood group will be B+. If agglutination occurs in A, B as well as D then the blood group will be AB+.
2. If agglutination occurs in A and D but not in B then the blood group will be A+. If agglutination did not occur in A, but in B and D, the blood group would be B+. If agglutination occurs in D but not in A and B then the blood group will be O+.If there is no agglutination in any of these, i.e. A, B and D, then the blood group will be O-. If agglutination occurs in B and not in A and D then the blood group will be B-.

What happens if a patient is given an incompatible blood group?

The patient must receive a compatible blood group. Incompatible blood groups can cause a serious transfusion reaction. If a patient receives an incompatible blood type, their immune system attacks and destroys the transfused red blood cells. This causes a severe reaction, which can lead to shock, kidney failure, and even death.

Note- A person with AB+ blood group is a “universal acceptor”, their blood can receive transfusions from any blood group (A, B, AB, or O), including both Rh positive and Rh negative.

A person with O- blood group is a universal donor, their blood can be transfused to recipients of any blood group (A, B, AB, or O), both Rh positive and Rh negative.

I hope you found my article informative. If you have any doubts in your mind then please leave your questions in the comment box below.

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