Certified Paraoptometric (CPO) Practice Exam 2025

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In medical prefixes, what does "Ab-" denote?

To, toward
Without
Away
Different

The correct answer is: Away

The prefix "Ab-" denotes the concept of being away from something. In medical terminology, it is often used to indicate a separation or movement away from a structure or location in the body. For example, in the term "abduction," which refers to moving a limb away from the body, "ab-" conveys this directional meaning effectively. The other prefixes do not capture this specific meaning. "To, toward" typically corresponds with prefixes like "ad-," which indicates direction towards something. "Without" is represented by the prefix "a-" or "an-." "Different" is best associated with prefixes like "hetero-." Therefore, the choice of "Ab-" as denoting "away" is accurate and aligns well with its usage in medical terminology.