Hi @bunjo, plasma is in the highest demand at the moment. Daily you can see which blood types are need by visiting
- Blood Inventory at Mayo Clinic Rochester MN https://connect.mayoclinic.org/page/blood-donor-program/

The data is updated daily.

@lioness, the most common blood type is O negative. Here's a breakdown:
O positive: 35%
O negative: 13%
A positive: 30%
A negative: 8%
B positive: 8%
B negative: 2%
AB positive: 2%
AB negative: 1%