Today’s factismal: The human body creates two million red blood cells every second.
On a typical day, some 41,000 units of blood will be needed in the US alone. But no day is average; there are good days and bad days. And most of the bad blood days happen in January when there are more accidents and fewer people donating blood. As a result, blood banks are always critically short of blood during the long winter months. And that is why January is National Blood Donor Month.
When you donate blood to the Red Cross, they use it specifically for saving lives through transfusions. But your one pint of blood may be used for as many as three different transfusions! They can do that because blood consists of plasma (55%), red blood cells (40%), white blood cells (3%), and platelets (2%). After you donate, your blood is tested for communicable diseases as a precautionary measure. Next it is separated into red blood cells (which carry oxygen), platelets (which cause the blood to clot), and plasma (which holds the other two). By using the red blood cells on one person, the platelets for a second, and giving the plasma to a third, your one donation can save three lives!
Of the three components, red blood cells are the most important. That’s because the red blood cells are covered with proteins that can form clots if they don’t match the proteins in the serum. Fortunately, back in 1901, Karl Landsteiner discovered that most people have red blood cells that are covered with one of three different sets of proteins. He called them “groups A, B, and C”; this was changed into A, B, and O by later workers. And just six years later, in 1907 the first successful blood transfusion took place in New York. Thanks to his work, there are now more than 30 million successful blood donations every year in the US alone!
|Blood Type||Rh Factor||How many have it?|
|O||+||1 person in 3|
|O||–||1 person in 15|
|A||+||1 person in 3|
|A||–||1 person in 16|
|B||+||1 person in 12|
|B||–||1 person in 67|
|AB||+||1 person in 29|
|AB||–||1 person in 167|
If you’d like to be one of the 15 million people who donate blood every year, then why not contact the Red Cross? Every drop of blood that they get is used specifically for transfusions and they are always need more than they have, especially in January. So go give!