How to Dose Insulin for Carb Ratios and Corrections – Healthline

When a doctor diagnoses insulin-dependent diabetes, you will quickly learn that precise carbohydrate counting and correct insulin dosing for meals and higher blood sugars are both key to effective diabetes management.

But terms like insulin to carbohydrate ratio and correction factor can get confusing, especially if youre newly diagnosed with the condition.

This article will explain how insulin works when eating food and how to dose insulin to keep blood sugars in range.

All humans need insulin to live. It helps digest the glucose (sugar) contained in most foods, particularly:

All carbs are processed into glucose thats eventually converted into energy that fuels the brain and body.

As that sugar moves from the bloodstream into cells, it makes your blood sugar levels rise.

In people without diabetes, the body automatically adjusts for this cycle on a natural autopilot.

For people with diabetes, the insulin-producing cells in the pancreas dont make insulin the same way they do in those without the condition. That means people with diabetes must address that insulin functionality for regulating glucose levels themselves.

People with type 2 diabetes (T2D) may not require insulin treatment because lifestyle changes can manage the condition.

That is not the case for type 1 diabetes (T1D). T1D is an autoimmune condition. People with T1D require insulin treatment by injection or with a diabetes device because their bodies dont make it on their own.

People using insulin pumps rely solely on rapid-acting insulin for both their bolus insulin and basal insulin. The insulin pump releases a very small amount of insulin in constant increments throughout the day, mimicking a human pancreas.

People who dont use an insulin pump may be injecting insulin multiple times a day. That might mean they take one or two long-acting insulin injections per day, whether thats with a vial and syringe or a plastic prefilled insulin pen.

This is in addition to their rapid-acting insulin, which can also be taken in the form of a syringe and vial or with an insulin pen.

An insulin-to-carb (I:C) ratio is the amount of rapid-acting insulin required to essentially cover the number of carbs a person eats or drinks.

While many people tend to focus on calories when discussing food labels and nutritional information, those who live with diabetes and require insulin often look first at the carb counts on nutrition labels.

Everyones I:C ratio varies. This is because everyones diabetes is different. But as an example, an I:C ratio may look something like this:

Always talk with your diabetes care team about what your goal blood sugar range should be. Those healthcare professionals can help you figure out your ideal I:C ratio based on many factors, including your:

Simply calculating your I:C ratio for a meal doesnt take into account your insulin correction factor. This figure is how much 1 unit of rapid-acting acting insulin will lower your blood sugar.

For example, if you are dosing insulin for a particular carb amount, youd want to take less insulin for those carbs if youre having a blood sugar lower than 70 mg/dL.

You would also need additional insulin beyond the I:C ratio if you have a higher blood sugar at the time.

Correction factors are just like I:C ratios in that they can vary individually and even depending on the time of day. This is all part of the discussion with your diabetes care team to determine what might be the best rates for your needs.

To figure out a rough estimate of your I:C ratio, divide the number 500 by your total daily dose (TDD) of insulin, which includes both long-acting and rapid-acting insulin. This is known as the 500 rule.

To roughly calculate your correction factor, take the number 1,800 and divide that by your TDD. This is known as the 1,800 rule.

Remember, always work with your care team to finely tune both your I:C ratio and correction factor.

Most insulin pumps now do this math automatically when recommending a bolus of insulin. However, for people taking multiple daily injections, calculating these figures manually is required for all meals, snacks, and drinks.

Both insulin-to-carbohydrate ratio and correction factor are important tools to have in your diabetes tool belt. They can help you better manage your diabetes and blood sugar levels so you feel better.

Insulin-to-carb ratio and correction factor can change over time. They depend on many elements, including lifestyle, diet, life circumstances, weight, sex, age, and health goals.

Always work with your doctor and care team to determine your most appropriate insulin-to-carb ratio and correction factor.

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How to Dose Insulin for Carb Ratios and Corrections - Healthline