According to media reports, the Central Blood Station of Wenshan Zhuang and Miao Autonomous Prefecture in Yunnan Province recently announced a major discovery: During routine blood screening of blood donors, the extremely rare "small P blood type" was detected for the first time.This is the first time in the 22 years since the blood station was established that this blood type has been recorded among nearly 570,000 blood donors. Its rarity shocked the medical community.
The discovery resulted from "irregular antibody screening" on the blood of a type O blood donor. The staff found that his serum had abnormal agglutination reactions with standard detection cells.
To find out the reason,Wenshan Prefecture Central Blood Station and the Guangzhou Blood Center Clinical Blood Transfusion Institute jointly conducted rigorous serology and genetic testing and finally confirmed that the blood of the donor contained rare anti-PP1Pk (anti-Tja) antibodies, and his blood type was the small p type in the P blood group system.Since this blood type was discovered by Austrian scientist Landsteiner in 1927, only a handful of cases have been reported around the world.
According to statistics,The frequency of "small p blood type" is less than one in a million. This probability is much lower than Rh-negative blood (commonly known as "panda blood", about 0.3%, or three thousandths) and Bombay-like blood (commonly known as "dinosaur blood", about one hundred thousand).It is characterized by the lack of P-type specific antigens on red blood cells and the presence of potent anti-Tja antibodies in the serum.
The discovery of "small p blood type" poses severe challenges to clinical blood transfusion safety: Blood donor's perspective: If blood containing "small p blood type" containing anti-Tja antibodies is transfused to ordinary patients, it may cause fatal hemolytic transfusion reactions.
If a patient with "small P blood type" needs red blood cell transfusion, he must receive blood of the same ABO type or O type and the same small P blood type. Otherwise, transfusion of ordinary blood containing P antigen will trigger autoantibodies, leading to severe hemolysis and life-threatening consequences.
For patients with such rare blood types, solutions include: autologous blood transfusion, mutual blood donation by relatives, and seeking help from national or regional rare blood type banks. The discovery in Wenshan Prefecture not only fills the gap in the local rare blood type database, but its detailed testing process and confirmation experience also provides valuable scientific basis and practical reference for identifying and managing such extremely rare blood type cases nationwide and even globally in the future, and improving blood transfusion safety early warning and guarantee capabilities.
