Which needle size is smaller?

The 25-gauge needle is considered smaller than the other options provided. Needle gauges are inversely related to their size; as the gauge number increases, the diameter of the needle decreases. In this case, a 25-gauge needle has a narrower lumen compared to 14-gauge, 18-gauge, and 22-gauge needles.

In a clinical setting, the size of the needle used can affect the type of procedure being performed. Smaller needles, such as the 25g, are generally used for less invasive procedures or for tasks where less trauma to the tissue is desired, such as injecting medications or drawing blood from small veins. In contrast, larger needles, like those sized 14g or 18g, may be used for procedures that require greater fluid flow or for sampling from larger areas of the body.