AACN Certification Practice Test 2025 – Comprehensive Exam Prep

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What is the normal range for prothrombin time (PT)?

9-14 seconds

11-16 seconds

The normal range for prothrombin time (PT) is typically considered to be between 11-16 seconds. Prothrombin time measures how long it takes for blood to clot, specifically assessing the extrinsic and common pathway of coagulation. This range can vary slightly between different laboratories due to variations in testing methods and reagents, but the value of 11-16 seconds is widely accepted in clinical practice.

Options outside this range reflect either a more narrow (9-14 seconds or 8-12 seconds) or wider (12-18 seconds) assessment that may not accurately represent the typical coagulation status in healthy individuals. Therefore, 11-16 seconds is optimal for determining whether a patient’s clotting factors are functioning correctly, and it is essential for monitoring patients on anticoagulant therapy or those with clotting disorders.

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12-18 seconds

8-12 seconds

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