Q 01/05

Blood types are defined by antigens on the surface of what?

A) White cells

B) Platelets

C) Plasma proteins

D) Red cells

Answer · why

D) Red cells

The antigens can be proteins, carbohydrates, glycoproteins or glycolipids depending on the blood group system.

Q 02/05

Which two blood group systems matter most when matching blood for a transfusion?

A) Kell and Duffy

B) ABO and Rh

C) MNS and Lewis

D) Kidd and Lutheran

Answer · why

B) ABO and Rh

Together they give the familiar labels such as A+, O- or AB+.

Q 03/05

How many human blood group systems did the ISBT recognise as of 2025?

A) 4

B) 48

C) 12

D) 36

Answer · why

B) 48

A truly complete blood type would describe a person's status in every one of the 48 systems recognised by 2025.

Q 04/05

Which blood group has neither the A nor the B antigen on its red cells?

A) AB

B) O

C) A

D) B

Answer · why

B) O

Its plasma carries both anti-A and anti-B antibodies, which is why it can only receive from its own group.

Q 05/05

People with which ABO group are known as 'universal recipients' for red cells?

A) O

B) A

C) B

D) AB

Answer · why

D) AB

Their plasma has no anti-A or anti-B antibodies, so red cells from any group are tolerated, but they can only donate to their own group.

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