What is the significance of the Hh blood group system in transfusion medicine?

A It is associated with an increased risk of hemolytic disease of the newborn
B It is linked to a decreased expression of ABO blood group antigens ✓
C It is responsible for a rare form of autoimmune hemolytic anemia
D It has no clinical significance in transfusion medicine

Explanation

The Hh blood group system is linked to a decreased expression of ABO blood group antigens, which can lead to weakened ABO reactions and potential transfusion complications.

Source

Transfusion Medicine Reviews
Hematology Hematology: Blood Grouping and Crossmatching Hematology: Blood Grouping and Crossmatching Medium MEDICAL Confidence: medium