Pharmacy Technician Certification Exam Practice Question
Which of the following needle gauges corresponds to the smallest lumen?
Correct Answer: D
Rationale: The gauge number of a needle indicates its diameter, with higher numbers corresponding to smaller lumens. Therefore, a gauge of 27 has the smallest lumen among the options provided.
Option A (13) represents a very large lumen, suitable for significant fluid flow. Option B (18) also has a larger lumen, commonly used for blood draws and transfusions. Option C (20) is still larger than 27, often used for general injections. In contrast, option D (27) is designed for precise injections, such as those used in dermatology or for administering vaccines, making it the needle with the smallest lumen.
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