Technical fundamentals of subcutaneous administration

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For the specialist, knowing subcutaneous technique is part of professional competence. Key elements, presented as technical fundamentals:

• Materials: insulin syringes (usually U-100) with fine, short needles are used; the gauge is expressed in G, where a higher number indicates a thinner needle.
• Sites and rotation: the usual subcutaneous areas include the abdomen (avoiding the area around the navel), the outer thigh and the triceps region. Rotating sites prevents lipohypertrophy (thickening of the tissue that alters absorption).
• Aseptic technique: disinfection of the site and the vial stopper, and handling that preserves sterility; the preservative in bacteriostatic water limits, but does not replace, asepsis.
• Angle and skin fold: depending on tissue thickness, a skin fold and an angle (45–90°) are used to ensure deposition in the subcutaneous plane and not in muscle.
• Waste handling: safe disposal of sharps.

These fundamentals are presented as the technical basis of pharmaceutics. Their specific application to a person always belongs to the judgment of the responsible professional and the protocols of their institution.

Educational content for scientific purposes. It distinguishes preclinical from clinical evidence and is not medical advice, diagnosis or a recommendation for use. NeoPeptidos products are sold labelled for research use only (RUO).