A 65-year-old man who weighs 180 lb (81.8 kg) is to receive 1.5 mL of a viscous antibiotic by intramuscular (IM) injection. Which needle and syringe will be used?
a. 5/8 inch, 25-gauge needle with 5 mL syringe
b. 1 inch, 28-gauge needle with 4 mL syringe
c. 1 inch, 21-gauge needle with 3 mL syringe
d. 3 inch, 16-gauge needle with 1.5 mL syringe
ANS: C
It is important to correlate the syringe size to the size of the patient and the tissue mass. The usual amount injected intramuscularly is 0.5 to 2 mL. Needle lengths commonly used for adults are 1 to 1 inches long. A longer needle may be used for a significantly obese adult. Commonly used needle gauges for IM injections are 20 to 22 gauge. A 5/8 inch, 25-gauge needle is too short and too small to administer a viscous medication. A 1 inch, 28-gauge needle is too small to administer a viscous medication. A 3 inch, 16-gauge needle is too large and too long to administer medication to a patient this size.
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