Blood group:
       it show the which blood group r Donors which r Recipients

ABO and Rh blood type donation showing matches between donor and recipient types
Recipients	Donors
	O+	A+	B+	AB+	O- **	A-	B-	AB-
O+	•				•
A+	•	•			•	•
B+	•		•		•		•
AB+ *	•	•	•	•	•	•	•	•
O-					•
A-					•	•
B-					•		•
AB-					•	•	•	•