Final answer:
The regular insulin is most often administered via subcutaneous injection, which is both appropriate for home administration and effective for managing blood glucose levels in individuals with diabetes, particularly after high-glucose meals.
Step-by-step explanation:
The most often used route for administering regular insulin is subcutaneous injection. This method allows insulin to be absorbed slowly, providing a longer duration of action which is suitable for maintaining blood glucose levels over time. Insulin injections are critical for regulating blood sugar, especially after meals with high glucose content, making it an essential part of diabetes management. For people with insulin-dependent diabetes mellitus (IDDM), insulin injections can decrease blood glucose levels by facilitating the utilization of glucose by cells.
While intravenous administration can achieve high plasma levels and is used in healthcare settings for quick effects, it is not typically used for regular insulin administration at home. Intramuscular injections are less commonly used for insulin due to pain and variability in absorption. Intradermal injections are not used for insulin administration.