notes on blood group imtiyaz
Page 1: Blood Groups Overview
Blood groups include: A+, AB, B+, A, O, AB+, B, O+, AB, B, A, AB, AB, OA
Page 2: Introduction to Blood Groups
Humans have multiple blood group systems.
The ABO blood group system is the most important.
Discovered by Karl Landsteiner.
Page 3: Antigens (Ag)
Antigens cause immune system to produce antibodies.
Also known as immunogens.
Can be from environmental sources: chemicals, bacteria, viruses, pollen.
Page 4: Antibodies (Ab)
Antibodies (immunoglobulins) are Y-shaped proteins.
Identify and neutralize foreign objects like bacteria & viruses.
Types: IgA, IgD, IgE, IgG, IgM (GAMED).
Page 5: Antigen-Antibody Reactions
Sensitization: Binding of antigen to antibody (reversible).
Agglutination: Clumping of red blood cells.
Haemolysis: Breakdown of red blood cells.
Neutralization: Antibodies neutralize antigens, rendering them ineffective.
Page 6: Antigen-Antibody Reactions (Repeated)
Same as Page 5.
Page 7: Blood Group Antigens
Blood group antigens not destroyed by immune system.
Present from birth.
Page 8: Blood Group Antigens Summary
Type A: Antigen A, Anti-B antibodies.
Type B: Antigen B, Anti-A antibodies.
Type AB: Both antigens, neither antibodies.
Type O: Neither antigens, both antibodies.
Page 9: Blood Transfusion
Universal donors: Type O blood group.
Universal receivers: Blood group AB.
Page 10: Rh Blood Group
Complex blood group system named after Rhesus monkey.
Rh-negative individuals can have reactions if receiving Rh-positive blood.
Page 11: Rh Antigens
D antigen plus antigens C, c, E, and e described.
Immunogenicity order: D > c > E > C > e.
D antigen presence: Rh +ve, absence: Rh -ve.
Page 12: Du Antigen
Du: Weaker form of D antigen.
Some Anti-D antisera agglutinate Du red blood cells, others do not.
Non-agglutinated detected via Anti-globulin test.
Page 13: Du Antigen (Repeated)
Same as Page 12.
Page 14: Techniques for ABO Grouping
Methods: Slide Method, Tube Technique, Microplate Technique, Gel Card Technique.
Page 15: ABO Grouping by Slide Method
Overview of techniques: Slide, Tube, Microplate, Gel Card.
Page 16: ABO Grouping - Principles
Based on agglutination principle.
RBC antigens combine with antibodies in antisera to form clumping.
Page 17: ABO Grouping - Procedure
Use a clean slide divided into 3 parts: A, B & D.
Add blood drops and respective anti-sera (Anti-A, Anti-B, Anti-D).
Mix and observe for agglutination.
Page 18: ABO Grouping - Result Interpretation
O+ blood group indicates positive Rh status due to agglutination in Anti-D.
Page 19: Preparation of 3-5% Red Cell Suspension
Add 2 drops of RBC to a test tube.
Fill with normal saline, mix and centrifuge at 1000 RPM for 1 min.
Repeat washing 3-4 times.
Page 20: 3-5% Red Cell Suspension (Continued)
After washing, label a test tube as 5% RBC.
Mix 0.5 ml washed RBC with 10 ml saline for 5% RBC suspension.
Page 21: ABO Grouping by Tube Method
More sensitive and reliable than slide method.
Both forward (cell) and reverse (serum) grouping performed.
Page 22: ABO Grouping - Forward & Reverse Grouping
Forward grouping checks A and B antigens presence in RBC.
Reverse grouping checks anti-A and anti-B presence in serum.
Page 23: ABO Grouping - Method Details
Overview of forward and reverse grouping processes.
Page 24: ABO Grouping Interpretation
Shows agglutination reaction in cell and serum grouping table for interpretation.
Bombay blood group included in interpretation.
Page 25: ABO Grouping - Microplate Technique
Microplate has 96 wells for blood typing.
Sensitive and fast; can be automated.
Determines antibodies in plasma and antigens in RBC.
Page 26: ABO Grouping - Gel Card Technique
Modern approach using micro-tubes with gel matrix to trap agglutinates.
Blood mixed with reagents under incubation and centrifugation.
Page 27: Questions
Q1: RBC suspension used in tube method: 3-5% (B).
Page 28: Questions
Q2: Anti-D reacts with which antigen? (D).