How Long After Giving Insulin Should I Test (And Why)?

Exact Answer: Two Hours Before And After Eating

Insulin is the best way to prevent or avoid complications in diabetes. It manages the blood sugar level when a diabetes patient cannot make needed insulin or properly use it. It allows the glucose to break down and use in the form of energy. Depending on the type of diabetes, you may need to take a different type of insulin in a day.

This generally depends on several factors like diet, blood sugar level between meals, and so on.  Usage of insulin may be risky sometimes. Following a regular schedule of your mealtime and insulin would help to maintain the proper blood sugar level.

How Long After Giving Insulin Should I Test

How Long After Giving Insulin Should I Test?

Few people have diabetes of type one, and some have type two diabetes. In both cases, insulin intake is necessary to maintain the blood sugar level in a specific range. Usually, the food an individual eats decides the quantity of sugar that enters the bloodstream and how much time it takes to enter it. But, when you eat your food as a diabetic patient, it plays a crucial role. It is also important to note that rapid-acting insulin should be given before fifteen minutes of food consumption for sound effects. Usually, your respective doctor prescribes the quantity of insulin. 

In an ideal treatment, the working speed of insulin would be directly proportional to the rise in blood sugar meal per meal. Most individuals with diabetes take at least two shots, and some people may also need four to five shots per day. One should be careful while using rapid-acting insulin. Even sometimes, doctors prescribe to combine both rapid-acting and regular insulin.

EventsInformation Regarding The Events
Time is taken for Insulin to workThirty minutes
Time after Insulin to testTwo hours before and after eating

It is to be noted that insulin starts working in thirty minutes. Insulin must be tested two hours before as well as after eating food. This time can also be discussed by the doctor, and then the instructions can be followed accordingly.

Why Does It Take That Long After Giving Insulin To Test?

Both rapid-acting and regular insulin should be taken before meals. Though there is a specific time limit after the meal you can take insulin, it is strictly restricted to avoid taking insulin after food. Because once you start to eat, your body’s blood sugar level starts to rise, which does not allow insulin to do its work. To get a good result from insulin, it should be injected before thirty minutes of your meal. But the amount of insulin to intake depends on the number of carbohydrates you will eat after the respective insulin. Hypoglycemia is the name of the case when your body’s blood sugar level goes below average.

And when you miss the insulin shot before meals, it results in hypoglycemia. In such cases, blood sugar level goes below the normal level leading to a risky situation. Similarly, waiting too long or more than a specific time to test after insulin lowers the level. To avoid such spikes maintaining a regular time is suggested. If you have been using insulin and exercising more than usual, limiting the meal would affect individuals. It may also occur if you take too much insulin in a day. The front and side part of the thighs, upper arm, and abdomen are recommended places to inject insulin.

It takes that long after giving insulin to test because it needs to mix with the blood flow. Few times people tend to have side effects due to insulin but in sporadic cases. If you are trapped in any situation and could not test your meal at a specific time after insulin, then juice, glucose tablets, hard candies, and non-diet sodas are also good for the time being to save from hypoglycemia.


Overall, it can be concluded that it will lead to complications to calculate the exact amount of dose initially. Even without any prior knowledge, if you have injected the insulin too deep, it enters into muscle, and absorption rates tend to rise. In this case, the insulin will not last for long.

On average, it is advised to test two hours before and after eating. Always keep a record of your blood sugar level and inject the insulin very safely by using the right techniques to get more effective results. Respective doctors should be consulted immediately in case of side effects or complications where you may be advised to change the type of insulin or recommend other treatment.


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