Medical FIDSAP v2 Practice Test

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Which statement accurately describes the onset and duration of rapid-acting versus long-acting insulin?

Both have the same onset and duration.

Rapid-acting insulin onset 15–30 minutes with 3–5 hours duration; long-acting onset 1–2 hours with about 24 hours duration.

Understanding how fast insulin starts working and how long it lasts is essential for matching it to meals and daily dosing. Rapid-acting insulins begin to lower glucose fairly quickly—about 15 to 30 minutes after injection—and typically act for around 3 to 5 hours. This quick onset and short duration makes them ideal for covering postmeal rises in blood sugar. Long-acting insulins, on the other hand, take effect more slowly, usually starting about 1 to 2 hours after injection, and provide a steady effect for roughly 24 hours to maintain baseline insulin levels.

The described timelines align with how these insulins are used in practice: rapid-acting for immediate postmeal control and long-acting for basal, around-the-clock background insulin. Other timing patterns don’t fit the standard pharmacokinetics—for example, claiming the same onset and duration for both types, or giving a rapid-acting duration long enough to cover an entire day, or swapping the onset and duration characteristics between the two.

Rapid-acting onset 5–10 minutes; duration 8–12 hours; Long-acting onset 6–8 hours; duration 36–48 hours.

Rapid-acting onset 1–2 hours; duration 24 hours; long-acting onset 15–30 minutes; duration 3–5 hours.