Which type of insulin is expected to have peak action within 2-4 hours?

The correct response highlights that regular insulin is known for its peak action occurring within 2-4 hours after administration. This characteristic makes it particularly useful for managing blood glucose levels in acute settings, such as during meals or in patients with fluctuating blood sugar levels. Regular insulin is a short-acting insulin, which highlights its effectiveness within this specific time frame, making it appropriate for patients who require a rapid onset of action.

In contrast, NPH (Neutral Protamine Hagedorn) insulin is classified as an intermediate-acting insulin and typically reaches its peak action later, generally between 4-12 hours. This slower peak time is less suited for immediate correction of blood glucose levels compared to regular insulin. Lantus, known as insulin glargine, and Detemir, which is also a long-acting insulin, do not have a distinct peak and provide a steady level of insulin over a longer period, thus making them inappropriate for situations needing a peak action in 2-4 hours. This pharmacokinetic data is crucial for healthcare providers when choosing an insulin regimen tailored to the individual needs of their patients.