Anatomy & Physiology Hematological #8

Question

Which individual’s blood type is considered the universal donor?

Answers

  1. Type A positive
    • Rationale:

      Type A positive blood can be administered to those with type A positive and type AB positive blood; however, this is not the blood type that is considered the universal donor.

  2. Type B negative
    • Rationale:

      Type B negative blood can be administered to those with type B negative and type AB negative blood; however, this is not the blood type that is considered the universal donor.

  3. Type O negative
    • Rationale:

      Type O negative blood has no antigens; therefore, this is the blood type that is considered to be the universal donor.

  4. Type AB positive
    • Rationale:

      Type AB positive blood can be administered to those with type AB positive blood only; therefore, this is not the blood type that is considered the universal donor.

Overview

An individual blood type is classified by the absence, or presence, of antibodies and inherited substances located on the surface of RBCs.

Explanation

Learning Outcomes

There are four major blood groups. These groups are determined by either the absence or presence of two antigens (i.e., A, B) on the surface of red blood cells (RBCs). In addition to these antigens, there is a protein called the Rh factor, which can either be absent (negative) or present (positive) thus creating the 8 most common blood types. Type O negative blood has no antigens or proteins; therefore, this is the blood type that is the universal donor.

Test Taking Tip

Consider the different blood types and how they are classified, including antibodies, antigens, and proteins when determining the correct choice for this question.

Video Rationale