Here's the blood chart.

Blood Chart
O+ 
Receive from:  O+, O-
Donate To:  O+, A+, B+, AB+
O-
Receive from:  O-
Donate to:  ALL
A+
Receive from:  A+, A-, O+, O-
Donate to:  A+, AB+
A-
Receive from:  A-, O-
Donate to:  A+, A-, AB+, AB-
B+
Receive from:  B+, B-, O+, O-
Donate to:  B+, AB+
B-
Receive from:  B-, O-
Donate to:  B+, B-, AB+, AB-
AB+
Receive from:  ALL
Donate to:  AB+
AB-
Receive from:  AB-, A-, B-, O-
Donate to:  AB+, AB-

Do you know your blood type and the types of your family members? gotta have that info. I'm AB+, BTW. Just hook me up and pump it.