What is the standard gauge for IV catheters used in adults?

The standard gauge for IV catheters used in adults is 22 gauge. This size provides a balance between sufficient fluid flow and patient comfort, making it suitable for most intravenous therapies, including hydration and medication administration. The 22-gauge catheter enables a moderate flow rate while being less traumatic than larger gauges, which can be more suitable for high-velocity flows or certain medical situations.

In general practice, 22-gauge catheters are commonly used for peripheral IV access, particularly for patients who do not require large volumes of fluid or blood products rapidly. These catheters are also easier to insert compared to larger gauges, making them preferable in routine procedures or for patients with smaller veins.

In contrast, larger gauges (such as 14 and 16) might be necessary in specific situations, like emergency scenarios or surgical settings needing rapid infusion, but they are not considered standard for general adult use. Meanwhile, the 18-gauge catheter, while more commonly used than the smaller gauges for certain applications, still does not provide the same level of versatility and comfort as the 22-gauge in many typical patient care scenarios.