The eight groups
Know your group. Know your power.
Every group helps someone, but each helps differently. Common groups are needed constantly; rare negative groups are what banks run out of first in an emergency.
O+
roughly 1 in 3 of people
0 on the Assam register
O− rare
well under 1 in 30 of people
0 on the Assam register
A+
roughly 1 in 5 of people
0 on the Assam register
A− rare
under 1 in 100 of people
0 on the Assam register
B+
roughly 1 in 3 of people
0 on the Assam register
B− rare
roughly 1 in 90 of people
0 on the Assam register
AB+
roughly 1 in 13 of people
0 on the Assam register
AB− rare
roughly 1 in 250 of people
0 on the Assam register
Don't know your group?
Register anyway, choose "not sure". You'll know after your first donation, and camps test for free.
Register as a donor