The nurse prepares to administer 2.2 mL of an oil-based medication intramuscularly to a male patient who is 5 feet 10 inches tall and weighs 165 pounds. Which needle and syringe combina-tion should the nurse choose to administer the injection?
a. 20-gauge, 1 1/2-inch needle on a 3-mL syringe
b. 21-gauge, 1 1/2-inch needle on a 5-mL syringe
c. 23-gauge, 1-inch needle on a 3-mL syringe
d. 25-gauge, 1-inch needle on a 5-mL syringe
A
The patient is well proportioned; because the medication is a thick solution requiring a deep intramuscular (IM) injection, the nurse chooses a slightly larger gauge needle, 20-gauge, which is 1 1/2 inches long, to accommodate the thick medication and to reach deep within the muscle. A 21-gauge needle is appropriate, but the syringe is too large. A 23-gauge needle is too small, and the oil would not be able to get through the lumen. A 25-gauge, 1-inch needle is far too narrow and short for an IM injection.
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