What type of needle presents a smaller lumen?

A larger gauge needle presents a smaller lumen. In the context of needles, the gauge system indicates the diameter of the needle; therefore, the higher the gauge number, the smaller the internal diameter or lumen of the needle. For example, a 25-gauge needle has a smaller lumen compared to an 18-gauge needle. The precision in gauge sizing is crucial because the choice of needle can significantly affect the administration of medications and the withdrawal of fluids.

In contrast, a smaller gauge needle would have a larger lumen, allowing for greater flow. Double-ended and vented needles serve specialized purposes, such as accessing vials or allowing airflow, but do not pertain directly to the concept of needle gauge and lumen size in the same manner.