When administering parenteral medications, the nurse considers the viscosity of the fluid when determining which item?
1. The length of the needle required
2. The size of the syringe required
3. The size of the bevel required
4. The gauge of the needle required
Correct Answer: 4
The viscosity of the fluid is the thickness of the fluid. The thicker the fluid, the larger the bore of the needle required. The larger the bore of the needle, the smaller the gauge required. Viscous fluid might require a 20 gauge needle, whereas thinner, more watery fluid might require only a 22 gauge needle when giving an intramuscular injection. Length of the needle is not impacted by the viscosity of the fluid but by the route of administration. The size of the syringe is determined by the volume of fluid to administer. Although the bevel might increase as the gauge decreases, the size of the bevel is dependent on the gauge chosen. The gauge is not determined by the size of the bevel.
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