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Using Insulin

Why do I need to take insulin?

When you have diabetes you may not make insulin at all (Type 1) or you do not make enough to keep your blood glucose normal all the time (Type 2). You may taking diabetes pills and they are not working well. Your doctor has advised you to start insulin. You did not fail! This is the natural course of Type 2 diabetes. Now you need to learn all you can to use insulin correctly so that your blood glucose stays in normal range.

What are the kinds of insulin and how do they work?

Name of Insulin Starts Working Works Best  Ends Low Blood Glucose Most Likely
Very short-acting (Humalog) 10 mins 1 1/2 hrs 3 hrs 2 - 4 hrs
Short-acting (Regular) 20 mins 3-4 hrs 8 hrs 3 - 7 hrs
Intermediate-acting (N or L) 1 1/2 - 2 hrs 4-15 hrs 22-24 hrs 6 - 13 hrs
Long-acting (UltraLente) 4 hrs 10-24 hrs 36 hrs 12 - 28 hrs
Combination: 70%N / 30%R 0-1 hrs 3-13 hrs 12 - 20 hrs 3 - 12 hrs
Combination: 50%N 50%R 0-1 hrs 3- 12 hrs 12 - 20 hrs 3 - 12 hrs

*Humalog should be given 0-15 minutes before meal.

**Regular should be given 30 minutes before meal. 

How will I know if the insulin is working?

Testing your own blood glucose lets you judge how well your diabetes plan is working. Every person who has diabetes can benefit from testing his or her blood glucose.

Blood glucose goals: Normal Goal
Before meals <6.4 mmol/L 4.4 - 6.7 mmol/L
2 Hours after eating <7.8 mmol/L <10 mmol/L
Bedtime <6.7 mmol/L 5.5 - 7.8 mmol/L

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