If you’ve got it-and most of us do-you’re Rh-positive. The term Rh factor is commonly used to refer to the presence of a certain protein, the D antigen, on the surface of an individual’s red blood cells. Now, blood can seem like a loaded concept, I guess-essence of life, symbol of tribal identity, beverage of vampires, etc.-so maybe even the otherwise level-headed get weird about it sometimes. On examination, they generally seem to be people who had certain theories about how the world worked long before they learned of Rh negativity. Instead, as you say, the question is where these crypto-hematologists emerged from and what their deal is. But I’ll go out on a limb here and assume that none of my readers actually suspects some randy E.T. Various stalwart rationalists, bless ’em all, have labored above and beyond to debunk this stuff. Many links concerning Rh-negative blood look kosher enough in your search results but when clicked release a flood of wide-eyed theories about ethnic migration, blood-type-based dating tips, and offers to trace your ancestry back to extraterrestrials, angels, or lizards. That sure is some netherworld of dodgy disinfo you inadvertently spelunked into, Katrina-no place you’d want to find yourself without up-to-date antivirus software, an airtight pop-up blocker, and ideally a strong stomach. Where did all this crazy mythology surrounding blood types come from? -Katrina I’ve heard this can cause pregnancy issues, so I Googled “Rh-negative blood” and ran across a bunch of weirdo sites with “theories” about the origin of negative blood types and some online communities with seriously racist undertones.

Rh a negative blood type origin