Between 25-gauge and 30-gauge needles, which has the smaller lumen?

Between 25-gauge and 30-gauge needles, which has the smaller lumen?

• A. 25-Gauge
• B. 30-Gauge
• C. Both have the same lumen
• D. Neither is used for infiltration

Answer: (B)

The main idea is that needle bore size depends on the gauge: as the gauge number goes up, the lumen becomes smaller. So the higher-gauge needle is the thinner one and has the smaller lumen. In this comparison, the thinner, higher-gauge needle has the smaller bore. The other statements don’t fit because gauge size directly determines lumen size, so the bore isn’t the same between the two, and both gauges are used for infiltration depending on the technique.

The main idea is that needle bore size depends on the gauge: as the gauge number goes up, the lumen becomes smaller. So the higher-gauge needle is the thinner one and has the smaller lumen. In this comparison, the thinner, higher-gauge needle has the smaller bore. The other statements don’t fit because gauge size directly determines lumen size, so the bore isn’t the same between the two, and both gauges are used for infiltration depending on the technique.