intermediateMEDICAL

Blood Types & Transfusion Guide

Understanding blood compatibility to save lives

Anonymous
Dec 1, 2025
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Blood Transfusion System

Blood transfusions can save your life in DayZ… but the wrong blood type = death.

Blood Types in DayZ

There are 8 blood types: O-, O+, A-, A+, B-, B+, AB-, AB+


Universal Rules

  • O- → Universal DONOR (can give to anyone)
  • AB+ → Universal RECIPIENT (can receive from anyone)

💡 If you’re unsure, O- is always the safest to use.

Compatibility Guide

  • O- → O- only
  • O+ → O-, O+
  • A- → O-, A-
  • A+ → O-, O+, A-, A+
  • B- → O-, B-
  • B+ → O-, O+, B-, B+
  • AB- → O-, A-, B-, AB-
  • AB+ → All blood types

How to Transfuse

  1. Use a Blood Test Kit on yourself and the donor
  2. Check compatibility
  3. Donor uses a Blood Bag Kit on themselves
  4. Combine with an IV Start Kit
  5. Use the Blood Bag IV on the patient

⚠️ Always double-check blood types before transfusing.

Wrong Blood Type = Hemolytic Reaction

  • Instant unconsciousness
  • Massive blood loss (~1200 over 5 minutes)
  • Can be fatal if untreated

🚨 This is one of the fastest ways to die in DayZ.

Alternative: Saline Bag

  • Works on everyone (no blood matching needed)
  • Boosts blood regeneration for ~3 minutes

💡 Best emergency option if you don’t know blood types.


💀 Pro Tip: Always carry a Blood Test Kit or Saline Bag — it can be the difference between life and death.

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