Why O Negative Blood Is So Important

The group every trauma bay wants on the shelf.

First blood in, before typing

In accidents and emergencies, O− is transfused before the patient's group is known — minutes matter more than lab results.

Roughly 5–7% of people are O−, yet it's drawn on for every untyped emergency, so demand always outruns supply.

Being findable is the fastest way to be useful — an O− donor on HelpALife's map is a standing emergency resource for their whole area.

I'm O− — how often will I be called?

Only when there's a compatible request within your radius; you control frequency by radius and availability.

Can O− donors receive only O−?

Yes — one more reason O− donors should also recruit fellow O− friends.