Blood transfusion can save lives, significantly in emergencies involving extreme blood loss, childbirth problems, surgical procedure and critical diseases.
However, when donated blood shouldn’t be correctly screened and examined for compatibility, a process supposed to avoid wasting a affected person’s life can expose them to doubtlessly deadly problems.
While figuring out a donor’s blood group is an important first step, medical laboratory scientists say it’s not sufficient to determine whether or not the blood is safe for a recipient.
Adedoye David and Olaiya Oluwatoba, who’re medical laboratory scientists, defined to PT HEALTH WATCH that donated blood should endure further laboratory checks, together with crossmatching and screening for transfusion-transmissible infections, earlier than it’s launched for transfusion.
According to the scientists, blood grouping establishes an individual’s ABO and Rhesus (Rh) blood varieties, however doesn’t independently affirm compatibility between a donor and recipient.
They defined that crossmatching includes testing donor and recipient blood samples to determine doable reactions between antigens on pink blood cells and antibodies within the recipient’s blood. Such reactions could cause the destruction of pink blood cells, leading to doubtlessly critical transfusion reactions.
The scientists additionally cautioned in opposition to the idea that blood group O is mechanically safe for each recipient. Although group O pink blood cells are generally utilized in emergencies when a affected person’s blood group is unknown, some group O whole-blood donations comprise excessive ranges of anti-A and anti-B antibodies that may trigger haemolysis in recipients.
Beyond compatibility, one other necessary side of blood security is guaranteeing that donated blood doesn’t carry infections that could possibly be transmitted to sufferers.
Screening for infections
The scientists recognized hepatitis B, hepatitis C, human immunodeficiency virus (HIV 1 and a pair of) and syphilis as infections that have to be screened for earlier than donated blood is launched.
They defined that insufficient screening might flip hospitals and blood banks into channels for transmitting infections to sufferers who might already be weak due to their medical situations.
They highlighted enzyme-linked immunosorbent assay (ELISA) as a most well-liked screening methodology however famous that infections can generally escape detection when donors are within the window interval, throughout which an an infection is current however might not but be detectable by a selected check.
Although ELISA is a longtime screening methodology, it doesn’t utterly get rid of this threat. Nucleic acid testing (NAT), the place accessible, can detect some infections earlier by figuring out viral genetic materials.
Risks of incompatible or unsafe blood
According to the scientists, one main consequence of transfusing incompatible blood is a haemolytic transfusion response, which happens when the recipient’s immune system destroys transfused pink blood cells.
They recognized acute and delayed haemolytic transfusion reactions as doable problems. Acute reactions might current with sudden fever, chills, low blood strain and haemoglobinuria, whereas delayed reactions can develop days or even weeks after transfusion.
Infections corresponding to hepatitis B, hepatitis C, HIV and syphilis might also be transmitted by means of inadequately screened blood.
Although these problems can often happen regardless of routine screening, the scientists mentioned strict adherence to laboratory procedures and quality-control measures stays important to decreasing the dangers.
Maintaining requirements in blood banks
On the requirements guiding blood financial institution operations, the scientists referred to the International Organisation for Standardisation’s ISO 15189, which outlines high quality and competence necessities for medical laboratories.
They additionally highlighted exterior high quality evaluation, by means of which laboratories’ testing efficiency is evaluated, generally with the assist of reference laboratories.
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Acknowledging that hospitals might expertise blood shortages, the scientists maintained that shortage mustn’t justify abandoning important security procedures. They mentioned emergency launch of blood earlier than completion of all compatibility checks should observe established protocols, with applicable authorisation and documentation.
They additional defined that medical laboratory scientists are liable for figuring out blood teams, conducting compatibility checks, screening donations for infections, checking packed cell quantity (PCV), monitoring expiry dates and sustaining data of blood financial institution actions.
The scientists urged blood donors and sufferers’ kinfolk to ask questions on blood financial institution procedures, together with donor eligibility necessities, haemoglobin ranges, well being situations and an infection screening.
They mentioned higher communication between laboratory professionals, donors and sufferers’ kinfolk would enhance public understanding of blood security and strengthen confidence in transfusion providers.
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