Long acting insulin preparations are frequently administered by:
**Core Concept**
Long-acting insulin preparations are a type of basal insulin that provides a steady, continuous level of insulin throughout the day, mimicking the body's natural basal insulin production. These insulins are designed to be administered once or twice daily to control fasting blood glucose levels.
**Why the Correct Answer is Right**
Long-acting insulin preparations, such as glargine (Lantus) and detemir (Levemir), are administered once or twice daily to provide a steady, continuous level of insulin throughout the day. This type of insulin is designed to have a slow onset of action and a flat, prolonged duration of action, allowing it to mimic the body's natural basal insulin production. The slow absorption of these insulins from the injection site and their low peak levels minimize the risk of hypoglycemia.
**Why Each Wrong Option is Incorrect**
**Option A:** NPH insulin is an intermediate-acting insulin, not a long-acting insulin, and is typically administered twice daily.
**Option B:** Regular insulin is a short-acting insulin, not a long-acting insulin, and is typically administered before meals.
**Option C:** Premixed insulin is a combination of short-acting and intermediate-acting insulins, not a long-acting insulin, and is typically administered twice daily.
**Clinical Pearl / High-Yield Fact**
It's essential to differentiate between long-acting, intermediate-acting, and short-acting insulins based on their onset and duration of action to ensure optimal glucose control and minimize the risk of hypoglycemia.
**Correct Answer:** D.