Clinical ProceduresQuestion 30 of 100
Which needle and technique is most appropriate for a subcutaneous insulin injection in an average-size adult?
a.A 25 to 27 gauge, 5/8 inch needle inserted at 45 to 90 degrees depending on tissue thickness
b.An 18 gauge, 2 inch needle inserted at 90 degrees
c.A 21 gauge, 1.5 inch needle inserted at 15 degrees
d.A 28 gauge needle inserted at 10 degrees with the bevel down
Explanation
Subcutaneous injections use a short, fine needle, commonly 25 to 27 gauge and about 5/8 inch, inserted at 45 degrees or at 90 degrees when there is ample subcutaneous tissue. An 18 gauge, 2 inch needle is far too large and long and would enter muscle. A 15-degree or 10-degree bevel-down approach places medication in or above the dermis rather than the subcutaneous layer.
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