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Non-invasive procedure. A medical procedure is defined as non-invasive when no break in the skin is created and there is no contact with the mucosa, or skin break, or internal body cavity beyond a natural or artificial body orifice. For example, deep palpation and percussion are non-invasive but a rectal examination is invasive.
This is because the muscle tissue has a greater blood supply than the area just under the skin. Muscle tissue may also hold a larger volume of medication than subcutaneous tissue. Intramuscular injection may be used instead of intravenous injection because some drugs are irritating to veins.) The site selected for injection is cleaned with an alcohol swab. The skin is allowed to air dry. 3) The practitioner spreads out the skin of the selected site to isolate the muscle. 4) The needle is inserted into the muscle at about a 90 degree angle.