Question

question 107

a pharmacy technician should recognize that which of the following needle gauges would be most appropriate for withdrawing a viscous medication from a vial?

a 30-gauge needle
a 25-gauge needle
an 18-gauge needle
a 27-gauge needle

Explanation:

Analyze the relationship between needle gauge and lumen size

Using the Needle Gauge Sizes knowledge point

• Needle gauge numbers are inversely proportional to the diameter (lumen size) of the needle.
• A smaller gauge number indicates a wider opening (larger lumen), whereas a larger gauge number indicates a narrower opening (smaller lumen).

Determine the requirement for viscous medications

Using the Needle Gauge Sizes knowledge point

• Viscous (thick) medications require a wider lumen to flow easily and prevent resistance during withdrawal.
• Therefore, the smallest gauge number among the options is the most appropriate choice.

Compare the given options

Using the Needle Gauge Sizes knowledge point

• The options are: 30-gauge, 25-gauge, 18-gauge, and 27-gauge.
• Comparing the numbers: \(18 < 25 < 27 < 30\).
• The 18-gauge needle has the largest lumen, making it the most suitable for withdrawing a viscous medication.

Answer:

• A 30-gauge needle
• A 25-gauge needle
• An 18-gauge needle (Correct answer)
• A 27-gauge needle