The document discusses blood groups and blood typing. It notes that the International Society of Blood Transfusion recognizes 30 major blood group systems, including the ABO and Rh systems. It specifically describes the rare Bombay blood group (hh) where individuals do not express the H antigen found in blood group O. It also defines blood typing as a lab test to determine a person's blood type and lists the worldwide and Pakistani frequencies of the main blood groups O, A, B, and AB.

1. Blood Group
Dr.Shahida Baloch

2. Blood Groups
International blood group society (ISBT)
recognize 30 major blood group system
including
ABO system
Rh system

3. ABO blood group

4. Bombay Blood group
hh is a rare blood group also called
Bombay Blood group. Individuals
with the rare Bombay phenotype
(hh) do not express H antigen (also
called "substance H") (the antigen
which is present in blood group O).

5. What is blood typing / blood
grouping
Blood typing is a laboratory test
done to determine a person's blood
type.

6. frequency of occurrence of the
various blood groups
Blood Group World Wide Pakistan
O 50 % 38.43
A 40 % 22.95
B 8 % 32.05

7. frequency of occurrence of the
various blood groups
Blood Group World
Wide
Pakistan
AB > 2 % 2.02

8. Blood Groups
International blood group society (ISBT)
recognize 30 major blood group system
including
ABO system
Rh system

9. Refrences
AABB 15th edition