Which factor can affect the absorption and rate of IM/SC administration?

Which factor can affect the absorption and rate of IM/SC administration?

• A. Amount and composition of connective tissue
• B. Color of the injection site
• C. Patient age
• D. Ambient temperature

Answer: (A)

Absorption from IM and SC routes is driven by how well the injection site tissues are perfused and how easily the drug diffuses through the surrounding interstitial space. The amount and composition of connective tissue at the injection site set where the drug goes: into muscle, which has high blood flow and leads to faster absorption, or into subcutaneous fat and connective tissue, which have lower perfusion and slower absorption. More connective tissue and fat create a longer diffusion path and slower uptake, while a site with more lean muscle promotes quicker absorption. While factors like the color of the skin at the site, the patient’s age, or ambient temperature can modulate blood flow temporarily, they don’t determine the fundamental difference in absorption rate as decisively as the tissue composition does.

Absorption from IM and SC routes is driven by how well the injection site tissues are perfused and how easily the drug diffuses through the surrounding interstitial space. The amount and composition of connective tissue at the injection site set where the drug goes: into muscle, which has high blood flow and leads to faster absorption, or into subcutaneous fat and connective tissue, which have lower perfusion and slower absorption. More connective tissue and fat create a longer diffusion path and slower uptake, while a site with more lean muscle promotes quicker absorption. While factors like the color of the skin at the site, the patient’s age, or ambient temperature can modulate blood flow temporarily, they don’t determine the fundamental difference in absorption rate as decisively as the tissue composition does.