ARRT Patient Care Practice Exam

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Prepare for the ARRT Patient Care Exam. Access multiple choice questions with detailed explanations. Enhance your study experience and boost your exam readiness!

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The diameter of a needle's lumen is referred to as its:

bevel
gauge
hub
length

The correct answer is: gauge

The diameter of a needle's lumen is referred to as its gauge. Gauge is a standard measurement that indicates the size of the needle; a higher gauge number corresponds to a smaller diameter. This measurement is crucial in healthcare settings because the gauge size determines the appropriate needle for various procedures, affecting factors such as the flow rate of fluids or the ease of injection. The other terms listed do not describe the diameter of the needle's lumen. The bevel refers to the angled surface at the tip of the needle that helps create a smooth puncture in the skin. The hub is the part of the needle that connects to the syringe, providing a grip for handling, and the length is simply a measurement of how long the needle is, which varies for different applications but does not relate to the internal diameter of the needle itself. Understanding these distinctions helps in selecting the right needle for specific clinical tasks.