How long should heat or cold be avoided after injecting rapid-acting insulin?

How long should heat or cold be avoided after injecting rapid-acting insulin?

• A. 4-6 hours
• B. 1-3 hours
• C. 0-15 minutes
• D. 24 hours

Answer: (B)

When insulin is injected, it's absorbed from the subcutaneous tissue into the bloodstream, and temperature can change how fast that absorption happens. Heat tends to increase blood flow and speed absorption, while cold slows it down. For rapid-acting insulin, most of the absorption and the sharp action occur in the first few hours after injection, especially around the peak at about 1–2 hours. So avoiding heat or cold for about 1–3 hours helps keep the timing and effect of the dose predictable. Exposures outside that window are less likely to disrupt absorption in a consistent way, which is why options outside 1–3 hours aren’t considered appropriate.

When insulin is injected, it's absorbed from the subcutaneous tissue into the bloodstream, and temperature can change how fast that absorption happens. Heat tends to increase blood flow and speed absorption, while cold slows it down. For rapid-acting insulin, most of the absorption and the sharp action occur in the first few hours after injection, especially around the peak at about 1–2 hours. So avoiding heat or cold for about 1–3 hours helps keep the timing and effect of the dose predictable.

Exposures outside that window are less likely to disrupt absorption in a consistent way, which is why options outside 1–3 hours aren’t considered appropriate.