When blood glucose levels (also called blood sugar levels) are too high, it's called hyperglycemia.
Glucose is a sugar that comes from foods, and is formed and stored inside the body. It's the main source of energy for the body's cells and is carried to each through the bloodstream. But even though we need glucose for energy, too much glucose in the blood can be unhealthy.
Hyperglycemia is the hallmark of diabetes — it happens when the body either can't make insulin (type 1 diabetes) or can't respond to insulin properly (type 2 diabetes). The body needs insulin so glucose in the blood can enter the cells to be used for energy. In people who have developed diabetes, glucose accumulates in the blood, resulting in hyperglycemia.
Hyperglycemia can cause serious health problems if left untreated. Too much sugar in the bloodstream for long periods of time can cause damage to the vessels that supply blood to vital organs and can cause other types of damage to body tissues, which can increase the risk of heart disease and stroke, kidney disease, vision problems, and nerve problems in people with diabetes.
These problems don't usually show up in kids or teens with diabetes who have had the disease for only a few years. However, they can occur in adulthood in some people, particularly if they haven't managed or controlled their diabetes properly.
Blood sugar levels are considered high when they're above someone's target range. The diabetes health care team will let you know what your child's target blood sugar levels are, which will vary based on factors like your child's age.
A major goal in controlling diabetes is to keep blood sugar levels as close to the desired range as possible. It's a three-way balancing act of:
All of these need to be balanced to keep blood sugar levels under control. If any one is off, blood sugar levels can be, too.
In general, problems controlling blood sugar levels are due to one or more of the following:
The symptoms of hyperglycemia are similar to those experienced when someone is diagnosed with diabetes, such as:
As part of the diabetes management plan, you'll need to check your child's blood sugar levels daily with a blood glucose meter. Doing so will help you identify when your child has high blood sugar levels, which do not always cause symptoms. Someone who isn't testing regularly might have blood sugar levels high enough to damage the body without even realizing it.
The HbA1c test, which doctors usually order periodically, also can show if someone has been having significant hyperglycemia over time, even though the person may not have had obvious symptoms.
If you find that your child has consistently high blood sugar levels, the diabetes health care team may suggest adjusting the diabetes medications or meal plan to bring your child's blood sugar levels back into a healthy range.
In other cases, an equipment issue, like an insulin pump malfunction or expired insulin, may be the problem. Make sure you contact the diabetes team if your child's blood sugar levels are consistently above the target range.
Treating high blood sugar levels involves correcting the underlying cause. The diabetes health care team will give you specific advice on how to keep your child's blood sugar levels in a healthy range, but here are some suggestions for managing some causes of hyperglycemia:
|Underlying Cause||What to Do|
Not getting enough insulin or other diabetes medication
Not following the meal plan (like eating too much food on special occasions without adjusting medications)
Not getting enough exercise
Illness or stress
Use of medications that increase blood sugar
A single high blood sugar reading usually isn't cause for alarm — it happens to everyone with diabetes from time to time. However, consistently high blood sugar levels need to be addressed.
Insulin allows glucose to get into the body's cells. Without enough insulin, the body can't use glucose for energy and starts to use fat for fuel. This can occur, for example, when someone skips doses of insulin, or when the need for insulin suddenly increases (as in during stress or illness) and the doses are not adjusted.
When the body uses fat for energy, chemicals called ketones are released into the blood, causing diabetic ketoacidosis (DKA). Some of the ketones, like extra glucose, are passed out of the body through the urine.
But high levels of ketones in the blood can be a problem because they cause the blood to become acidic. Too much acid in the blood throws off the body's chemical balance and causes the symptoms mentioned below.
DKA is a very serious — but completely preventable — condition that can lead to coma or death if it's not treated promptly. It occurs more often in people with type 1 diabetes but can sometimes happen to those with type 2 diabetes.
The symptoms of DKA usually don't develop all at once — they usually come on slowly over several hours. The signs and symptoms of DKA include:
These symptoms are caused by the sustained hyperglycemia (usually lasting several hours) that typically occurs before someone develops DKA.
If the person remains untreated, these symptoms can occur:
How do you know if your child has DKA? The signs and symptoms of DKA can mimic or be triggered by other illnesses, like the flu, so it's very important to check your child's blood sugar levels and urine ketones during illness — especially if there are high blood sugar readings — or if your child has symptoms of DKA.
Because high levels of ketones in the blood will cause ketones to appear in the urine, ketones can be checked at home by testing a sample of your child's urine. If the urine test for ketones is negative, it generally means that symptoms are not due to DKA. However, because the urine test for ketones is very sensitive, and because ketones can even appear in the urine of an ill child without DKA, you should contact the health care team for advice according to the instructions you have been given regarding a positive test for ketones.
Tests done by a lab or hospital can confirm whether a child has DKA, if necessary. Some newer blood glucose meters also offer the option of testing blood for ketones. Ask the diabetes health care team if such a meter is a good idea for your child.
DKA requires immediate medical treatment with intravenous (IV) insulin and fluids and close monitoring in a hospital. Contact the diabetes health care team immediately or seek emergency care if your child is sick and you don't know what to do or if you think your child is having symptoms of DKA.
All adult family members and your child's caregivers and school staff should know about the risk of DKA in a child with diabetes, and they should know when to call 911.
In addition, all kids and teens with diabetes should wear some sort of medical identification (like a bracelet or necklace) and/or carry medical identification (ID) information at all times. Besides identifying your child as having diabetes, these IDs can provide emergency contact information.
The best way to prevent DKA is to treat high blood sugar levels appropriately, which means following the diabetes management plan prescribed by the diabetes health care team.
Make sure that your child:
By regularly monitoring blood sugar levels, you will know when your child's blood sugar is high. If that happens, contact the diabetes health care team for more information and to learn how to help bring your child's diabetes back under control and avoid complications like DKA.
Reviewed by: Steven Dowshen, MD
Date reviewed: July 2013
|National Institute of Diabetes and Digestive and Kidney Diseases This group conducts and supports research on many serious diseases affecting public health.|
|American Diabetes Association (ADA) The ADA website includes news, information, tips, and recipes for people with diabetes.|
|Children With Diabetes This website offers true stories about kids and teens who have diabetes.|
|Joslin Diabetes Center The website of this Boston-based center has information about how to monitor blood sugar and manage diabetes.|
|Juvenile Diabetes Research Foundation International (JDRF) JDRF's mission is to find a cure for diabetes and its complications through the support of research.|
|Definition: Ketoacidosis Ketoacidosis is a severe life-threatening condition requiring immediate treatment.|
|Definition: Ketones When fats are broken down for energy, chemicals called ketones appear in the blood and urine.|
|Blood Glucose Record Some kids who have diabetes need to regularly check their blood sugar levels. This form can help you keep track of the readings. Talk with your parents and doctor to see if this should be part of your diabetes managment plan.|
|Blood Glucose Record If you have diabetes, you can use this printable sheet to record your blood glucose levels.|
|When Blood Sugar Is Too High Too much glucose in the blood can be unhealthy. Learn more about what to do when blood sugar is too high in this article for kids.|
|When Blood Sugar Is Too Low Hypoglycemia is the medical word for low blood sugar level. It needs to be treated right away. Learn more about what to do when blood sugar is too low in this article for kids.|
|When Blood Sugar Is Too Low When blood glucose levels drop too low, it's called hypoglycemia. Very low blood sugar levels can cause severe symptoms that need to be treated right away.|
|Diabetes Control: Why It's Important People who have diabetes may hear or read a lot about controlling, or managing, the condition. But what is diabetes control and why is it so important?|
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|Blood Test: Glucose The blood glucose test, which measures the amount of sugar in the blood, may be done as part of a routine physical, to help diagnose type 1 or type 2 diabetes, or during pregnancy to check for gestational diabetes.|
|Diabetes Center Does your child have type 1 or type 2 diabetes? Learn how to manage the disease and keep your child healthy.|
|Diabetes Center Our Diabetes Center provides information and advice for teens about treating and living with diabetes.|
|Keeping Track of Your Blood Sugar To keep your diabetes under control, stay healthy, and prevent future problems, you need to keep blood sugar levels in a healthy range. To do that, check and track those levels regularly.|
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|What Is Hypoglycemia? Lots of people wonder if they have hypoglycemia, but the condition is not common in teens. Get the facts on hypoglycemia.|
|Diabetes Control: Why It's Important You've probably heard your child's doctor talk a lot about diabetes control. What is it and why is it important?|
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|Diabetes Center Diabetes means a problem with insulin, an important hormone in the body. Find out how children with diabetes can stay healthy and do the normal stuff kids like to do.|
|Word! Ketoacidosis Ketoacidosis, a condition that can happen to people with diabetes, occurs when the body uses fat instead of glucose for fuel.|
|Word! Ketones When fat is broken down, chemicals called ketones are produced.|
|Diabetes Control: Why It's Important Keeping blood sugar levels under control can help keep you healthy and prevent health problems from happening down the road. Find out more.|
|Blood Glucose Record If your child has diabetes, you can use this printable sheet to record his or her blood glucose levels.|
|Type 2 Diabetes: How Is It Treated? People with type 2 diabetes need to follow a plan to manage their diabetes and stay healthy and active.|
|Type 2 Diabetes: What Is It? Diabetes is a disease that affects how the body uses glucose, a sugar that is the body's main source of fuel. Find out more about a kind of diabetes called type 2 diabetes in this article for kids.|
|Type 2 Diabetes: What Is It? Teens with type 2 diabetes and have to pay close attention to what they eat and do.|
|Type 1 Diabetes: What Is It? Diabetes is a disease that affects how the body uses glucose, a sugar that is the body's main source of fuel. In type 1 diabetes, glucose can't get into the body's cells where it's needed.|
|Diabetes: When to Call the Doctor Caring for a child with diabetes includes knowing when to get medical help. Learn more about when to call the doctor.|
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