Computed Tomography Technologist Practice Exam

For flow rates over 3 mL/s, it is essential to select a needle gauge that can facilitate sufficient fluid flow without causing hemolysis or damage to the blood cells or tissues. A 20 gauge needle or higher is recommended for this purpose.

A 20 gauge needle is large enough to accommodate the increased flow rate, allowing for faster administration of fluids or medications without significant resistance. This gauge strikes a good balance between providing a sufficient lumen size to allow quick flow while minimizing trauma to the vessels.

Using a gauge larger than 20, such as an 18 gauge needle, can also be appropriate for very high flow rates, but a 20 gauge is generally sufficient for rates over 3 mL/s for most clinical settings. Opting for a needle smaller than 20 gauge, like a 22 gauge or 24 gauge, could hinder the flow, potentially leading to complications such as increased pressure buildup and risk of hemolysis, making them less suitable for this specific flow requirement. Hence, selecting a 20 gauge or a higher gauge needle is the correct choice for ensuring safe and effective flow rates.