Which is the smallest needle?

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Study for the AALAS Laboratory Animal Technician Test. Enhance your knowledge with comprehensive questions and detailed explanations. Prepare effectively for your LAT certification exam!

Multiple Choice

Which is the smallest needle?

Explanation:
Needle diameter follows an inverse gauge rule: higher gauge numbers mean smaller bore. So the smallest needle among these options is the one with the highest gauge number, which is 25 gauge. It has the finest diameter, smaller than 22, 20, or 18 gauge needles. In practice, a smaller bore minimizes tissue trauma and is often used for injections into delicate tissues or for small animals, while larger bore needles (lower gauge numbers) allow faster flow or easier aspiration.

Needle diameter follows an inverse gauge rule: higher gauge numbers mean smaller bore. So the smallest needle among these options is the one with the highest gauge number, which is 25 gauge. It has the finest diameter, smaller than 22, 20, or 18 gauge needles. In practice, a smaller bore minimizes tissue trauma and is often used for injections into delicate tissues or for small animals, while larger bore needles (lower gauge numbers) allow faster flow or easier aspiration.

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