Sid blood group system

Sid blood group system is a blood group system recognized by the International Society of Blood Transfusion (ISBT). It is one of the 36 human blood group systems currently identified by the ISBT. The Sid blood group system was named after the first identified antibody, anti-Sid, which was discovered in 2002.

History

The Sid blood group system was discovered in 2002 when a new antibody, anti-Sid, was identified in the serum of a woman who had been transfused multiple times. The antibody was named Sid after the patient's initials. The discovery of this new blood group system has expanded our understanding of human blood and its compatibility for blood transfusion.

Characteristics

The Sid blood group system is characterized by the presence or absence of the Sid antigen on the surface of red blood cells. Individuals who have the Sid antigen are classified as Sid positive, while those who lack the antigen are classified as Sid negative. The Sid antigen is a protein that is encoded by the SID gene.

Clinical significance

The clinical significance of the Sid blood group system lies in its potential to cause hemolytic disease of the newborn (HDN) and hemolytic transfusion reaction (HTR). If a Sid negative individual is transfused with Sid positive blood, the recipient's immune system may produce anti-Sid antibodies, leading to a hemolytic transfusion reaction. Similarly, if a Sid negative woman is pregnant with a Sid positive fetus, the mother's immune system may produce anti-Sid antibodies, potentially leading to hemolytic disease of the newborn.

Testing

Testing for the Sid blood group system is performed using serological methods. The presence or absence of the Sid antigen is determined by testing the patient's red blood cells with anti-Sid serum. If the red blood cells agglutinate, the patient is considered Sid positive. If no agglutination occurs, the patient is considered Sid negative.

See also

• Blood group system
• Blood transfusion
• Hemolytic disease of the newborn
• Hemolytic transfusion reaction

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