AB Blood

Overview of Blood Types and Donation

  • Explanation of AB negative blood type

    • Definition: AB negative blood type includes

    • Presence of A antigen on red blood cell membrane.

    • Presence of B antigen on red blood cell membrane.

    • Absence of Rh factor on the red blood cell membrane (indicated by 'negative').

  • Immune Response:

    • The immune system will produce antibodies against foreign antigens that are not present in the individual.

    • For a patient with AB negative blood:

    • Since the patient lacks the Rh factor, exposure to Rh-positive cells triggers the immune system to produce antibodies against Rh.

    • Therefore, they cannot accept blood containing the Rh antigen.

Donor Selection for AB Negative Blood Type

  • Identifying suitable donors:

    • Assess which blood types have the Rh factor.

    • Elimination Process:

    • Individuals with positive blood types (e.g. A+, B+, AB+, O+) carry the Rh factor.

    • Thus, all positive blood donors must be eliminated from the donor pool.

    • Remaining donor types for a patient with AB negative blood type:

    • A-

    • B-

    • AB-

    • O-

Donor Considerations for AB Negative Patients

  • Considering the reverse scenario: What if the donor is AB negative?

  • Focus on which antigens are present on the donor’s red blood cells:

    • Antigens present in the AB negative donor:

    • A antigen

    • B antigen

  • Antibody Consideration:

    • Identify which patient groups have antibodies against the present antigens.

    • For the A antigen:

    • Patient groups with antibodies against A antigen:

      • B group (has antibody against A)

      • O group (has antibody against A)

    • Eliminate B and O from the patient list.

    • For the B antigen:

    • Patient groups with antibodies against B antigen:

      • A group (has antibody against B)

      • O group (has antibody against B)

    • Eliminate A and O from the patient list.

    • Remaining acceptors for AB negative blood type:

    • Patients who can accept AB negative blood:

      • AB positive

      • AB negative

Summary of Donation Compatibility

  • AB negative blood type can donate to:

    • AB positive blood type

    • AB negative blood type

  • Negative blood types can donate to both positive and negative blood types.

  • Conclusion: Determining compatibility in blood donation requires understanding both antigens present and antibodies produced by the immune system.