American Association of Critical-Care Nurses (AACN) Certification Practice Test

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Prepare for the AACN Certification Test. Study with flashcards and multiple choice questions, each question comes with hints and explanations. Get ready for your exam!

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What does a normal Ankle-Brachial Index (ABI) range from?

0.5-0.7
0.7-0.8
0.8-1.0
1.1-1.3

The correct answer is: 0.8-1.0

The Ankle-Brachial Index (ABI) is a valuable diagnostic tool used to assess peripheral artery disease (PAD) by comparing blood pressure in the patient's ankle with the blood pressure in the arm. A normal ABI typically ranges from 1.0 to 1.4, indicating that blood flow is adequate. The range of 0.8 to 1.0, identified in the correct answer, suggests that the individual's blood flow is still considered normal, though the lower end may require additional evaluation to rule out early signs of peripheral artery disease. An ABI below 0.8 generally indicates some level of arterial blockage, while values above 1.4 could suggest stiff arteries, which might also warrant further investigation. Therefore, the correct understanding of the normal ABI indicates that a reading in the range of 0.8 to 1.0 is a sign of proper circulation, reflecting the health of the vascular system.