Studying earlier experiments with animals, scientists had noticed that these foreign bodies were broken up in the human bloodstream by hemoglobin, which resides on red blood cells and carries oxygen through the body.
In 1901, Karl Landsteiner realized that similar reactions were occurring with human-to-human blood transfers. Common conditions, like shock or jaundice, could be coming from these failed transfers.
His work attracted moderate attention- a successful blood transfusion was made using his work in New York in 1907 … but in 1909, when Landsteiner was able to classify human blood into a variety of type, his work really took off. These groups are what are commonly known today as A, B, AB, and O groups.
Later in life, Landsteiner moved to New York. There in 1937, with forensic scientist Alexander Weiner, he discovered the Rhesus factor. Named after a similar property found in the Rhesus monkey, all blood has a Rhesus (Rh) factor, either positive or negative. Both of these discoveries would become crucial to how blood transfers work today.
While it would be several decades until the exact chemical makeup of antigens were discovered, with help from scientists like Elvin Kabat, Landsteiner laid down the basics.
The four major groups are decided by if they do or do not have two antigens, commonly known as A and B. Each of these antigens have an Rh factor, a positive or a negative. That's what leads to the commonly known blood types A+, A-, B+, B-, O+, O-, AB+, AB-.
A person with blood type O is called a universal donor, and is able to donate blood to a person of any blood type ... but is able to receive blood only from a person with the same blood type.
However, in the United States, AB-negative is considered to be the rarest blood type, and O-positive the most common. The Stanford School of Medicine Blood Center ranks blood types in the United States from rarest to most common as follows:
Again, this ranking isn’t universal. In India, for example, the most common blood type is B-positive, while in Denmark it’s A-positive. These variations also exist within groups of Americans. According to the Red Cross, for instance, Asian Americans are much more likely to have a B-positive blood type than Latin Americans and Caucasians.
I'm A- how about you/others?
We're going to have to start charging tuition on MarketForum for educating everybody (-:
And you know what? Ive never asked my siblings or parents( when they were alive )what their blood type is-something to do soon.
O+. I can donate to anyone but O-
O+. It feels good to be so non-partisan.