DayZ Blood Type Compatibility Tool
Select a donor and receiver blood type to see if the transfusion is safe — or fatal. Getting this wrong causes a hemolytic reaction with no antidote.
Transfusion Checker
Select both a donor and receiver blood type above to see the verdict.
💧
Saline Bag IV — Always Safe
When in doubt, use a Saline Bag IV. It restores 500 blood regardless of blood type and never causes an adverse reaction. It's the safe choice when you don't know the donor's type.
Full 8×8 Compatibility Matrix
Rows = Donor | Columns = Receiver | Y = Safe | N = Hemolytic Reaction
| Donor ↓ / Recv → | O+ | O- | A+ | A- | B+ | B- | AB+ | AB- |
|---|---|---|---|---|---|---|---|---|
| O+ | Y | N | Y | N | Y | N | Y | N |
| O-★ | Y | Y | Y | Y | Y | Y | Y | Y |
| A+ | N | N | Y | N | N | N | Y | N |
| A- | N | N | Y | Y | N | N | Y | Y |
| B+ | N | N | N | N | Y | N | Y | N |
| B- | N | N | N | N | Y | Y | Y | Y |
| AB+ | N | N | N | N | N | N | Y | N |
| AB- | N | N | N | N | N | N | Y | Y |
★ O- is the universal donor — safe for all blood types. Your selected pair is highlighted.
Blood Type Spawn Probabilities
The chance a random player you encounter has each blood type — useful for planning what blood bags to carry.
O+
43%
O-
10%
Universal Donor
A+
23%
A-
5%
B+
9%
B-
3%
AB+
2%
Universal Receiver
AB-
2%