Type 2 diabetes is usually diagnosed using the glycated hemoglobin (A1C) test. This blood test indicates your average blood sugar level for the past two to three months. Results are interpreted as follows:
- Below 5.7% is normal.
- 5.7% to 6.4% is diagnosed as prediabetes.
- 6.5% or higher on two separate tests indicates diabetes.
If the A1C test isn't available, or if you have certain conditions that interfere with an A1C test, your doctor may use the following tests to diagnose diabetes:
Random blood sugar test. Blood sugar values are expressed in milligrams of sugar per deciliter (mg/dL) or millimoles of sugar per liter (mmol/L) of blood. Regardless of when you last ate, a level of 200 mg/dL (11.1 mmol/L) or higher suggests diabetes, especially if you also have signs and symptoms of diabetes, such as frequent urination and extreme thirst.
Fasting blood sugar test. A blood sample is taken after an overnight fast. Results are interpreted as follows:
- Less than 100 mg/dL (5.6 mmol/L) is normal.
- 100 to 125 mg/dL (5.6 to 6.9 mmol/L) is diagnosed as prediabetes.
- 126 mg/dL (7 mmol/L) or higher on two separate tests is diagnosed as diabetes.
Oral glucose tolerance test. This test is less commonly used than the others, except during pregnancy. You'll need to fast overnight and then drink a sugary liquid at the doctor's office. Blood sugar levels are tested periodically for the next two hours. Results are interpreted as follows:
- Less than 140 mg/dL (7.8 mmol/L) is normal.
- 140 to 199 mg/dL (7.8 mmol/L and 11.0 mmol/L) is diagnosed as prediabetes.
- 200 mg/dL (11.1 mmol/L) or higher after two hours suggests diabetes.
Screening. The American Diabetes Association recommends routine screening with diagnostic tests for type 2 diabetes in all adults age 45 or older and in the following groups:
- People younger than 45 who are overweight or obese and have one or more risk factors associated with diabetes
- Women who have had gestational diabetes
- People who have been diagnosed with prediabetes
- Children who are overweight or obese and who have a family history of type 2 diabetes or other risk factors
After a diagnosis
If you're diagnosed with diabetes, your doctor or health care provider may do other tests to distinguish between type 1 and type 2 diabetes — since the two conditions often require different treatments.
Your health care provider will repeat the test A1C levels at least two times a year and when there are any changes in treatment. Target A1C goals vary depending on your age and other factors. For most people, the American Diabetes Association recommends an A1C level below 7%.
You will also receive regular diagnostic tests to screen for complications of diabetes or comorbid conditions.
Management of type 2 diabetes includes:
- Healthy eating
- Regular exercise
- Weight loss
- Possibly, diabetes medication or insulin therapy
- Blood sugar monitoring
These steps will help keep your blood sugar level closer to normal, which can delay or prevent complications.
Contrary to popular perception, there's no specific diabetes diet. However, it's important to center your diet around:
- A regular schedule for meals and healthy snacks
- Smaller portion sizes
- More high-fiber foods, such as fruits, nonstarchy vegetables and whole grains
- Fewer refined grains, starchy vegetables and sweets
- Modest servings of low-fat dairy, low-fat meats and fish
- Healthy cooking oils, such as olive oil or canola oil
- Fewer calories
Your health care provider may recommend seeing a registered dietitian, who can help you:
- Identify healthy choices among your food preferences
- Plan well-balanced, nutritional meals
- Develop new habits and address barriers to changing habits
- Monitor carbohydrate intake to keep your blood sugar levels more stable
Exercise is important for losing weight or maintaining a healthy weight. It also helps with regulating blood sugar levels. Talk to your primary health care provider before starting or changing your exercise program to ensure that activities are safe for you.
Aerobic exercise. Choose an aerobic exercise that you enjoy, such as walking, swimming, biking or running. Adults should aim for 30 minutes or more of moderate aerobic exercise on most days of the week, or at least 150 minutes a week. Children should have 60 minutes of moderate to vigorous aerobic exercise daily.
Resistance exercise. Resistance exercise increases your strength, balance and ability to perform activities of daily living more easily. Resistance training includes weightlifting, yoga and calisthenics.
Adults living with type 2 diabetes should aim for two to three sessions of resistance exercise each week. Children should engage in activities that build strength and flexibility at least three days a week. This can include resistance exercises, sports and climbing on playground equipment.
Limit inactivity. Breaking up long bouts of inactivity, such as sitting at the computer, can help control blood sugar levels. Take a few minutes to stand, walk around or do some light activity every 30 minutes.
Weight loss results in better control of blood sugar levels, cholesterol, triglycerides and blood pressure. If you're overweight, you may begin to see improvements in these factors after losing as little as 5% of your body weight. However, the more weight you lose, the greater the benefit to your health and disease management.
Your health care provider or dietitian can help you set appropriate weight-loss goals and encourage lifestyle changes to help you achieve them.
Monitoring your blood sugar
Your health care provider will advise you on how often to check your blood sugar level to make sure you remain within your target range. You may, for example, need to check it once a day and before or after exercise. If you take insulin, you may need to do this multiple times a day.
Monitoring is usually done with a small, at-home device called a blood glucose meter, which measures the amount of sugar in a drop of your blood. You should keep a record of your measurements to share with your health care team.
Continuous glucose monitoring is an electronic system that records glucose levels every few minutes from a sensor placed under your skin. Information can be transmitted to a mobile device such as your phone, and the system can send alerts when levels are too high or too low.
If you can't maintain your target blood sugar level with diet and exercise, your doctor may prescribe diabetes medications that help lower insulin levels or insulin therapy. Drug treatments for type 2 diabetes include the following.
Metformin (Fortamet, Glumetza, others) is generally the first medication prescribed for type 2 diabetes. It works primarily by lowering glucose production in the liver and improving your body's sensitivity to insulin so that your body uses insulin more effectively.
Some people experience B-12 deficiency and may need to take supplements. Other possible side effects, which may improve over time, include:
- Abdominal pain
Sulfonylureas help your body secrete more insulin. Examples include glyburide (DiaBeta, Glynase), glipizide (Glucotrol) and glimepiride (Amaryl). Possible side effects include:
- Low blood sugar
- Weight gain
Glinides stimulate the pancreas to secrete more insulin. They're faster acting than sulfonylureas, and the duration of their effect in the body is shorter. Examples include repaglinide and nateglinide. Possible side effects include:
- Low blood sugar
- Weight gain
Thiazolidinediones make the body's tissues more sensitive to insulin. Examples include rosiglitazone (Avandia) and pioglitazone (Actos). Possible side effects include:
- Risk of congestive heart failure
- Risk of bladder cancer (pioglitazone)
- Risk of bone fractures
- High cholesterol (rosiglitazone)
- Weight gain
DPP-4 inhibitors help reduce blood sugar levels but tend to have a very modest effect. Examples include sitagliptin (Januvia), saxagliptin (Onglyza) and linagliptin (Tradjenta). Possible side effects include:
- Risk of pancreatitis
- Joint pain
GLP-1 receptor agonists are injectable medications that slow digestion and help lower blood sugar levels. Their use is often associated with weight loss, and some may reduce the risk of heart attack and stroke. Examples include exenatide (Byetta, Bydureon), liraglutide (Saxenda, Victoza) and semaglutide (Rybelsus, Ozempic). Possible side effects include:
- Risk of pancreatitis
SGLT2 inhibitors affect the blood-filtering functions in your kidneys by inhibiting the return of glucose to the bloodstream. As a result, glucose is excreted in the urine. These drugs may reduce the risk of heart attack and stroke in people with a high risk of those conditions. Examples include canagliflozin (Invokana), dapagliflozin (Farxiga) and empagliflozin (Jardiance). Possible side effects include:
- Risk of amputation (canagliflozin)
- Risk of bone fractures (canagliflozin)
- Risk of gangrene
- Vaginal yeast infections
- Urinary tract infections
- Low blood pressure
- High cholesterol
Other medications your doctor might prescribe in addition to diabetes medications include blood pressure and cholesterol-lowering medications, as well as low-dose aspirin, to help prevent heart and blood vessel disease.
Some people who have type 2 diabetes need insulin therapy. In the past, insulin therapy was used as a last resort, but today it may be prescribed sooner if blood sugar targets aren't met with lifestyle changes and other medications.
Different types of insulin vary on how quickly they begin to work and how long they have an effect. Long-acting insulin, for example, is designed to work overnight or throughout the day to keep blood sugar levels stable. Short-acting insulin might be used at mealtime.
Your doctor will determine what type of insulin is appropriate for you and when you should take it. Your insulin type, dosage and schedule may change depending on how stable your blood sugar levels are. Most types of insulin are taken by injection.
Side effects of insulin include the risk of low blood sugar (hypoglycemia), diabetic ketoacidosis and high triglycerides.
Weight-loss surgery changes the shape and function of your digestive system. This surgery may help you lose weight and manage type 2 diabetes and other conditions related to obesity. There are various surgical procedures, but all of them help you lose weight by limiting how much food you can eat. Some procedures also limit the amount of nutrients you can absorb.
Weight-loss surgery is only one part of an overall treatment plan. Your treatment will also include diet and nutritional supplement guidelines, exercise and mental health care.
Generally, weight-loss surgery may be an option for adults living with type 2 diabetes who have a body mass index (BMI) of 35 or higher. BMI is a formula that uses weight and height to estimate body fat. Depending on the severity of diabetes or comorbid conditions, surgery may be an option for someone with a BMI lower than 35.
Weight-loss surgery requires a lifelong commitment to lifestyle changes. Long-term side effects include nutritional deficiencies and osteoporosis.
Women with type 2 diabetes will likely need to change their treatment plans and adhere to diets that carefully controls carbohydrate intake. Many women will need insulin therapy during pregnancy and may need to discontinue other treatments, such as blood pressure medications.
There is an increased risk during pregnancy of developing diabetic retinopathy or a worsening of the condition. If you are pregnant or planning a pregnancy, visit an ophthalmologist during each trimester of your pregnancy, one year postpartum or as advised.
Signs of trouble
Regularly monitoring your blood sugar levels is important to avoid severe complications. Also, be aware of signs and symptoms that may suggest irregular blood sugar levels and the need for immediate care:
High blood sugar (hyperglycemia). Eating certain foods or too much food, being sick, or not taking medications at the right time can cause high blood sugar. Signs and symptoms include:
- Frequent urination
- Increased thirst
- Dry mouth
- Blurred vision
Hyperglycemic hyperosmolar nonketotic syndrome (HHNS). This life-threatening condition includes a blood sugar reading higher than 600 mg/dL (33.3 mmol/L). HHNS may be more likely if you have an infection, are not taking medicines as prescribed, or take certain steroids or drugs that cause frequent urination. Signs and symptoms include:
- Dry mouth
- Extreme thirst
- Dark urine
Diabetic ketoacidosis. Diabetic ketoacidosis occurs when a lack of insulin results in the body breaking down fat for fuel rather than sugar. This results in a buildup of acids called ketones in the bloodstream. Triggers of diabetic ketoacidosis include certain illnesses, pregnancy, trauma and medications — including the diabetes medications called SGLT2 inhibitors.
Although diabetic ketoacidosis is usually less severe in type 2 diabetes, the toxicity of the acids can be life-threatening. In addition to the signs and symptoms of hypoglycemia, such as frequent urination and increased thirst, ketoacidosis may result in:
- Abdominal pain
- Shortness of breath
- Fruity-smelling breath
Low blood sugar. If your blood sugar level drops below your target range, it's known as low blood sugar (hypoglycemia). Your blood sugar level can drop for many reasons, including skipping a meal, unintentionally taking more medication than usual or being more physical activity than usual. Signs and symptoms include:
- Blurred vision
- Heart palpitations
- Slurred speech
If you have signs or symptoms of low blood sugar, drink or eat something that will quickly raise your blood sugar level — fruit juice, glucose tablets, hard candy or another source of sugar. Retest your blood in 15 minutes. If levels are not at your target, repeat the sugar intake. Eat a meal after levels return to normal.
If you lose consciousness, you will need to be given an emergency injection of glucagon, a hormone that stimulates the release of sugar into the blood.
Explore Mayo Clinic studies testing new treatments, interventions and tests as a means to prevent, detect, treat or manage this condition.
Lifestyle and home remedies
Careful management of type 2 diabetes can reduce your risk of serious — even life-threatening — complications. Consider these tips:
- Commit to managing your diabetes. Learn all you can about type 2 diabetes. Make healthy eating and physical activity part of your daily routine.
- Work with your team. Establish a relationship with a diabetes educator, and ask your diabetes treatment team for help when you need it.
- Identify yourself. Wear a necklace or bracelet that says you are living with diabetes, especially if you take insulin or other blood sugar-lowering medication.
- Schedule a yearly physical exam and regular eye exams. Your regular diabetes checkups aren't meant to replace regular physicals or routine eye exams.
- Keep your vaccinations up to date. High blood sugar can weaken your immune system. Get a flu shot every year. Your health care provider may also recommend the pneumonia vaccine. The Centers for Disease Control and Prevention (CDC) also recommends the hepatitis B vaccination if you haven't previously received this vaccine and you're 19 to 59 years old.
- Take care of your teeth. Diabetes may leave you prone to more-serious gum infections. Brush and floss your teeth regularly and schedule recommended dental exams. Consult your dentist right away if your gums bleed or look red or swollen.
- Pay attention to your feet. Wash your feet daily in lukewarm water, dry them gently, especially between the toes, and moisturize them with lotion. Check your feet every day for blisters, cuts, sores, redness and swelling. Consult your health care provider if you have a sore or other foot problem that isn't healing.
- Keep your blood pressure and cholesterol under control. Eating healthy foods and exercising regularly can go a long way toward controlling high blood pressure and cholesterol. Take medication as prescribed.
- If you smoke or use other types of tobacco, ask your health care provider to help you quit. Smoking increases your risk of various diabetes complications. Talk to your health care provider about ways to stop smoking tobacco.
- Use alcohol sparingly. Depending on the type of drink, alcohol may lower or raise blood sugar levels. If you choose to drink alcohol, only do so with a meal. The recommendation is no more than one drink daily for women and no more than two drinks daily for men. Check your blood sugar frequently after consuming alcohol.
Many alternative medicine treatments claim to help people living with diabetes. According to the National Center for Complementary and Integrative Health, studies haven't provided enough evidence to recommend any alternative therapies for blood sugar management. Research has shown the following results about popular supplements for type 2 diabetes:
- Chromium supplements have been shown to have few or no benefits. Large doses can result in kidney damage, muscular problems and skin reactions.
- Magnesium supplements have shown benefits for blood sugar control in some but not all studies. Side effects include diarrhea and cramping. Very large doses — more than 5,000 mg a day — can be fatal.
- Cinnamon, in some studies, has lowered fasting glucose levels but not A1C levels. Therefore, there's no evidence of overall improved glucose management. Most cinnamon contains a substance called coumarin that may cause or worsen liver disease.
Talk to your doctor before starting a dietary supplement or natural remedy. Do not replace your prescribed diabetes medication with alternative medicines.
Coping and support
Type 2 diabetes is a serious disease, and following your diabetes treatment plan takes round-the-clock commitment. To meet the demands of diabetes management, you may need a good support network.
Anxiety and depression are common in people living with diabetes. Talking to a counselor or therapist may help you cope with the lifestyle changes or stressors that come with a type 2 diabetes diagnosis.
Support groups can be good sources of diabetes education, emotional support, and helpful information, such as how to find local resources or where to find carbohydrate counts for a favorite restaurant. If you're interested, your health care provider may be able to recommend a group in your area.
You can visit the American Diabetes Association website to check out local activities and support groups for people living with type 2 diabetes. The American Diabetes Association also offers online information and online forums where you can chat with others who are living with diabetes. You can also call the organization at 800-DIABETES (800-342-2383).
Preparing for your appointment
Keeping your annual wellness visits enables your health care provider to screen for diabetes and to monitor and treat conditions that increase your risk of diabetes — such as high blood pressure, high cholesterol or a high BMI.
If you are seeing your health care provider because of symptoms that may be related to diabetes, you can prepare for your appointment by being ready to answer the following questions:
- When did your symptoms begin?
- Does anything improve the symptoms or worsen the symptoms?
- What medicines do you take regularly, including dietary supplements and herbal remedies?
- What are your typical daily meals? Do you eat between meals or before bedtime?
- How much alcohol do you drink?
- How much daily exercise do you get?
- Is there a history of diabetes in your family?
If you are diagnosed with diabetes, your health care provider will begin a treatment plan. You may be referred to a doctor who specializes in hormonal disorders (endocrinologist). Your care team may also include the following specialists:
- Certified diabetes educator
- Foot doctor (podiatrist)
- Doctor who specializes in eye care (ophthalmologist)
Talk to your health care provider about referrals to other specialists who will be providing care.
Questions for ongoing appointments
Before any appointment with a member of your treatment team, make sure you know whether there are any restrictions, such as fasting before taking a test. Questions that you should regularly review with your doctor or other members of the team include:
- How often do I need to monitor my blood sugar, and what is my target range?
- What changes in my diet would help me better manage my blood sugar?
- What is the right dosage for prescribed medications?
- When do I take the medications? Do I take them with food?
- How is management of diabetes affecting treatment for other conditions? How can I better coordinate treatments or care?
- When do I need to make a follow-up appointment?
- Under what conditions should I call you or seek emergency care?
- Are there brochures or online sources you recommend?
- Are there resources available if I'm having trouble paying for diabetes supplies?
What to expect from your doctor
Your provider is likely to ask you a number of questions at regularly scheduled appointments, including:
- Do you understand your treatment plan and feel confident you can follow it?
- How are you coping with diabetes?
- Have you experienced any low blood sugar?
- Do you know what to do if your blood sugar is too low or too high?
- What's a typical day's diet like?
- Are you exercising? If so, what type of exercise? How often?
- Do you sit for long periods of time?
- What challenges are you experiencing in managing your diabetes?
Jan. 20, 2021