Which needle gauge has the smallest bore?

Which needle gauge has the smallest bore?

• A. 16 gauge
• B. 21 gauge
• C. 20 gauge
• D. 25 gauge

Answer: (D)

The main idea here is how gauge relates to bore size. Needle gauge and bore are inversely related: as the gauge number goes up, the inner diameter gets smaller. So the smallest bore among the options is the finest needle, which corresponds to the largest gauge value in the set. This finest needle is often chosen when you want to minimize tissue trauma or work with small animals or delicate tissues. The other options use lower gauge numbers, meaning thicker needles with larger bores, which are used when rapid fluid flow or drawing viscous fluids is needed.

The main idea here is how gauge relates to bore size. Needle gauge and bore are inversely related: as the gauge number goes up, the inner diameter gets smaller. So the smallest bore among the options is the finest needle, which corresponds to the largest gauge value in the set. This finest needle is often chosen when you want to minimize tissue trauma or work with small animals or delicate tissues. The other options use lower gauge numbers, meaning thicker needles with larger bores, which are used when rapid fluid flow or drawing viscous fluids is needed.