Table of ContentsView AllTable of ContentsSigns and SymptomsTypes of TestsWho Should Be TestedNext StepsFrequently Asked Questions
Table of ContentsView All
View All
Table of Contents
Signs and Symptoms
Types of Tests
Who Should Be Tested
Next Steps
Frequently Asked Questions
Type 2 diabetesis a serious medical condition that involveshigh blood sugarlevels. It occurs when the body cannot process glucose (sugar) properly.About one-third of adults in the United States with diabetes don’t know they have the disease.If you have symptoms or are at risk for diabetes, talk to your healthcare provider about getting tested.
Learn about type 2 diabetes, its signs and symptoms, the tests used to diagnose the condition, and more.
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Signs and Symptoms of Type 2 Diabetes
Many people with type 2 diabetes don’t know they have it.Some people may not havesymptoms, while others' symptoms are too mild to recognize.However, there are some warning signs to take note of.
Symptoms of type 2 diabetes may include:
While recognizing symptoms is important, it’s also helpful to be aware of risk factors for type 2 diabetes. These include:
Additionally, African American, American Indian, Asian American, Hispanic/Latino, and Pacific Islander populations, and people over the age of 35, have a higher prevalence of a type 2 diabetes diagnosis.
Tests Used to Diagnose Type 2 Diabetes
There are multiple tests that could be used to check for type 2 diabetes. The specific test used depends on the individual, their symptoms, andrisk factors.
How Type 2 Diabetes Is Diagnosed
Fasting Blood Sugar Test
Thefasting blood sugar testis a blood test used to check the glucose levels in your blood after eight to 10 hours of fasting (other than water).A needle is placed into a vein to pull out a small amount of blood for testing.This test is usually scheduled in the morning afterfastingall night and before any food is eaten.
Fasting Blood Sugar Test ResultsNormal: Lower than 100 milligrams of glucose per deciliter of blood (mg/dL)Prediabetes: 100–125 mg/dLDiabetes: Higher than 125 mg/dL
Fasting Blood Sugar Test Results
Normal: Lower than 100 milligrams of glucose per deciliter of blood (mg/dL)Prediabetes: 100–125 mg/dLDiabetes: Higher than 125 mg/dL
What to Know About Blood Glucose Levels
Hemoglobin A1C Test
Hemoglobin A1C Test ResultsNormal: Lower than 5.7% (average blood sugar)Prediabetes: 5.7%–6.4%DiabetesHigher than 6.4%
Hemoglobin A1C Test Results
Normal: Lower than 5.7% (average blood sugar)Prediabetes: 5.7%–6.4%DiabetesHigher than 6.4%
Random Blood Sugar Test
The random blood sugar test is also known as the random or casual plasma glucose test.It is typically used when someone is experiencing severe diabetes symptoms and is taken any time of the day regardless of whether they haverecently eaten.This test does not differentiate between the normal range and the prediabetes range.
Instead, a result of 200 mg/dL or more is considered diabetic.If the results are below the level that indicates diabetes, your healthcare provider may suggest another test to screen for prediabetes.
Random Blood Sugar Test ResultsNormal and Prediabetes: Lower than 200 mg/dLDiabetes: 200 mg/dL or higher
Random Blood Sugar Test Results
Normal and Prediabetes: Lower than 200 mg/dLDiabetes: 200 mg/dL or higher
Oral Glucose Tolerance Test
Theoral glucose tolerance testis a blood test that involves checking blood glucose levels at two different times. Blood is drawn for the first time after a person has gone without food or beverages other than water for at least eight hours.
Blood is drawn and tested again two to three hours after drinking a specific, sugary drink.The process allows medical professionals to see how the body responds to sugar. This test is often used to check forgestational diabetesin pregnant women.
Fasting Blood Sugar Test ResultsNormal: Lower than 140 mg/dLPrediabetes: 140–199 mg/dLDiabetes: 200 mg/dL or higher
Normal: Lower than 140 mg/dLPrediabetes: 140–199 mg/dLDiabetes: 200 mg/dL or higher
Early testing for diabetes is important since the disease is reversible. Lifestyle changes, such as eating ahealthy dietand incorporating regular exercise tolose weight, can help.Many people with type 2 diabetes don’t know they have it, so if you’re experiencing diabetes symptoms or are at risk, it’s a good idea to get tested for diabetes.
Reasons to be tested for type 2 diabetes include:
After being tested for diabetes, the following steps depend on the test results and other factors specific to the individual, such as their symptoms and lifestyle.
Test results may show blood sugar levels in one of the following ranges:
Some individuals may be asked to take additional blood tests.
If your blood sugar levels are higher than normal but lower than those considered diabetic, you are in the prediabetic range. Prediabetes means you are at an increased risk of developing diabetes.
Lifestyle changes, such as increasing physical activity and eating more nutritiously, can reverse a prediabetes and type 2 diabetes diagnosis.If your blood sugar levels are in the diabetic range, your healthcare provider may discussmedicationin addition to lifestyle changes.
Summary
Type 2 diabetes is a serious medical condition that involves high blood sugar due to the inability to process glucose properly. Testing blood sugar levels can determine if you have prediabetes or type 2 diabetes. Anyone who is at an increased risk of diabetes, or experiencing symptoms, should be tested.
Several blood sugar tests may be used, including the fasting blood sugar test, the hemoglobin A1C test, the random blood sugar test, and the oral glucose tolerance test. Your healthcare provider will determine which test is best for you.
If results determine prediabetes or type 2 diabetes, your healthcare provider will discuss the next steps with you. These may include additional testing, lifestyle changes such as nutrition and exercise, and medications.
A Word From Verywell
Suspecting, being diagnosed with, and living with type 2 diabetes can be challenging. If you or someone you know is at high risk of diabetes or is experiencing symptoms, reach out to a healthcare provider to see about testing. Prediabetes and type 2 diabetes can be managed and reversed with lifestyle changes, but getting tested is the first step toward treatment and recovery.
Frequently Asked QuestionsYes, it is possible to test blood sugar levels at home. However, these tests cannot be used to diagnose diabetes. Anyone who has symptoms or risk factors for diabetes should see a medical professional for testing.People taking insulin to manage their diabetes may test their blood sugar multiple times daily. For a diabetes diagnosis, how often you get tested depends on your risk level. Some people may test every three years, while others may test multiple times per year. Check with a healthcare provider to determine when to get tested.Yes, it is possible to have diabetes without knowing it. Some people may not have symptoms, while others are too minor to recognize. About one-third of adults with type 2 diabetes do not know they have diabetes.
Yes, it is possible to test blood sugar levels at home. However, these tests cannot be used to diagnose diabetes. Anyone who has symptoms or risk factors for diabetes should see a medical professional for testing.
People taking insulin to manage their diabetes may test their blood sugar multiple times daily. For a diabetes diagnosis, how often you get tested depends on your risk level. Some people may test every three years, while others may test multiple times per year. Check with a healthcare provider to determine when to get tested.
Yes, it is possible to have diabetes without knowing it. Some people may not have symptoms, while others are too minor to recognize. About one-third of adults with type 2 diabetes do not know they have diabetes.
13 SourcesVerywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read oureditorial processto learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.Centers for Disease Control and Prevention.Type 2 diabetes.National Institutes of Health.One third of adults with diabetes still don’t know they have it.American Diabetes Association.Understanding type 2 diabetes.National Institute of Diabetes and Digestive and Kidney Diseases.Risk factors for type 2 diabetes.National Institute of Diabetes and Digestive and Kidney Diseases.Diabetes tests and diagnosis.National Health Service.Blood tests.Centers for Disease Control and Prevention.Testing for diabetes.Centers for Disease Control and Prevention.Testing for diabetes and prediabetes: A1C.American Diabetes Association.Understanding diabetes diagnosis.National Institutes of Health.The A1C test and diabetes.National Institutes of Health.Tests and diagnosis for gestational diabetes.Hallberg SJ, Gershuni VM, Hazbun TL, et al.Reversing type 2 diabetes: A narrative review of the evidence.Nutrients. 2019;11(4):766. doi:10.3390/nu11040766Centers for Disease Control and Prevention.Prediabetes - your chance to prevent type 2 diabetes.
13 Sources
Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read oureditorial processto learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.Centers for Disease Control and Prevention.Type 2 diabetes.National Institutes of Health.One third of adults with diabetes still don’t know they have it.American Diabetes Association.Understanding type 2 diabetes.National Institute of Diabetes and Digestive and Kidney Diseases.Risk factors for type 2 diabetes.National Institute of Diabetes and Digestive and Kidney Diseases.Diabetes tests and diagnosis.National Health Service.Blood tests.Centers for Disease Control and Prevention.Testing for diabetes.Centers for Disease Control and Prevention.Testing for diabetes and prediabetes: A1C.American Diabetes Association.Understanding diabetes diagnosis.National Institutes of Health.The A1C test and diabetes.National Institutes of Health.Tests and diagnosis for gestational diabetes.Hallberg SJ, Gershuni VM, Hazbun TL, et al.Reversing type 2 diabetes: A narrative review of the evidence.Nutrients. 2019;11(4):766. doi:10.3390/nu11040766Centers for Disease Control and Prevention.Prediabetes - your chance to prevent type 2 diabetes.
Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read oureditorial processto learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
Centers for Disease Control and Prevention.Type 2 diabetes.National Institutes of Health.One third of adults with diabetes still don’t know they have it.American Diabetes Association.Understanding type 2 diabetes.National Institute of Diabetes and Digestive and Kidney Diseases.Risk factors for type 2 diabetes.National Institute of Diabetes and Digestive and Kidney Diseases.Diabetes tests and diagnosis.National Health Service.Blood tests.Centers for Disease Control and Prevention.Testing for diabetes.Centers for Disease Control and Prevention.Testing for diabetes and prediabetes: A1C.American Diabetes Association.Understanding diabetes diagnosis.National Institutes of Health.The A1C test and diabetes.National Institutes of Health.Tests and diagnosis for gestational diabetes.Hallberg SJ, Gershuni VM, Hazbun TL, et al.Reversing type 2 diabetes: A narrative review of the evidence.Nutrients. 2019;11(4):766. doi:10.3390/nu11040766Centers for Disease Control and Prevention.Prediabetes - your chance to prevent type 2 diabetes.
Centers for Disease Control and Prevention.Type 2 diabetes.
National Institutes of Health.One third of adults with diabetes still don’t know they have it.
American Diabetes Association.Understanding type 2 diabetes.
National Institute of Diabetes and Digestive and Kidney Diseases.Risk factors for type 2 diabetes.
National Institute of Diabetes and Digestive and Kidney Diseases.Diabetes tests and diagnosis.
National Health Service.Blood tests.
Centers for Disease Control and Prevention.Testing for diabetes.
Centers for Disease Control and Prevention.Testing for diabetes and prediabetes: A1C.
American Diabetes Association.Understanding diabetes diagnosis.
National Institutes of Health.The A1C test and diabetes.
National Institutes of Health.Tests and diagnosis for gestational diabetes.
Hallberg SJ, Gershuni VM, Hazbun TL, et al.Reversing type 2 diabetes: A narrative review of the evidence.Nutrients. 2019;11(4):766. doi:10.3390/nu11040766
Centers for Disease Control and Prevention.Prediabetes - your chance to prevent type 2 diabetes.
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