Why 7% · Why O−
Roughly 7% of people have O-negative blood.
When there's no time to test a patient's blood type, O-negative red cells can be the answer — in trauma bays, ambulances, operating rooms, and for newborns and infants.
7% For All exists to recognize, mobilize, and celebrate this small group — and everyone who shows up beside them.
Interactive
Who can you help?
Tap a blood type to see who it can give to — or who it can receive from. Every type matters. O− is the only one that reaches all eight.
O−
Can give red cells to every blood type.
O− · O+ · A− · A+ · B− · B+ · AB− · AB+
Simplified red blood cell compatibility. Hospitals always confirm matching before a transfusion.
An annual observance
The 7% Day
Once a year, on the Seventh Saturday, we call the 7% together — with the goal of an officially recognized Nevada and national observance. Can't join an official event? Donate wherever you are.
First annual observance
Feb 13, 2027
Don't know your blood type?
Donate to find out.
Most people have never been told their blood type. Donating is the easiest way to learn it — and you might discover you're one of the 7%.
01
Pledge
Add your name so we know you're coming — Las Vegas or near home.
02
Donate
Give blood with Vitalant on February 13, 2027. About an hour, start to finish.
03
Find out
Your blood type is shared with you after your donation. Welcome to the movement.