Which of the following statements about the normal INR range is true?

• A. INR values below 0.5 are typical in healthy individuals.
• B. A normal INR range is 0.8-1.2.
• C. An INR above 2.0 is expected in healthy individuals.
• D. INR is unrelated to PT.

Answer: (B)

Normal INR range is 0.8–1.2 because INR standardizes the prothrombin time (PT) to account for differences in lab reagents, giving a consistent measure of clotting tendency in healthy individuals. In people not on anticoagulants, an INR around 1.0 is expected; values within 0.8–1.2 are considered normal.

INR values much below 0.5 are not typical normal values, and an INR above 2.0 would be abnormal for healthy individuals, often indicating anticoagulation or a coagulation issue. INR is directly related to PT, not unrelated to it.