What is the normal international normalized ratio (INR) range?

What is the normal international normalized ratio (INR) range?

• A. 0.6-1.0
• B. 0.8-1.5
• C. 1.0-2.0
• D. 2.0-3.0

Answer: (B)

INR normal values reflect how long blood takes to clot, standardized so results are comparable across labs. For someone not on anticoagulants, the INR is about 1.0, with a typical reference range around 0.8 to 1.2 (lab variations exist). Among the given ranges, 0.8 to 1.5 best fits the normal window because it includes the expected value near 1.0 and stays close to the normal range. The other options either sit clearly below normal or imply a markedly higher baseline, which is not characteristic of a healthy, untreated individual.

INR normal values reflect how long blood takes to clot, standardized so results are comparable across labs. For someone not on anticoagulants, the INR is about 1.0, with a typical reference range around 0.8 to 1.2 (lab variations exist).

Among the given ranges, 0.8 to 1.5 best fits the normal window because it includes the expected value near 1.0 and stays close to the normal range. The other options either sit clearly below normal or imply a markedly higher baseline, which is not characteristic of a healthy, untreated individual.