screening for high sugar

Overview

High blood sugar means there is too much glucose (a simple sugar) in your blood. This can happen when your body cannot make enough of a hormone called insulin, cannot use insulin well, or both. Insulin helps move sugar into your cells for energy. Screening means having a simple blood test to find out if your blood sugar is in a healthy range, slightly high (sometimes called prediabetes), or very high (diabetes). Finding high blood sugar early gives you the chance to take steps that protect your health.

Yes. High blood sugar and diabetes are very common worldwide. Many people have higher-than-normal blood sugar and do not know it. In the UK, for example, millions of people live with diabetes or are at increased risk.

Anyone can have high blood sugar, but it is more common in adults over 40, people who are overweight, people who are not physically active, and those with a family history of diabetes. It can also affect children and younger adults, although the causes may be different.

Symptoms

Common symptoms

• Feeling very thirsty
• Urinating more often than usual
• Feeling very tired
• Blurred vision
• Unexpected weight loss
• Cuts or sores that heal slowly

Symptoms in children

• Urinating often or bedwetting (if a child previously stayed dry)
• Extreme thirst and a dry mouth
• Low energy and unusual tiredness
• Weight loss without trying
• Stomach pain or being grumpy or irritable

Symptoms in older adults

• Becoming confused or very sleepy
• Dry mouth and extreme thirst
• Urinating more often, especially at night
• Feeling weak or dizzy
• Repeated infections like urinary tract or skin infections

Causes

Main causes

• Your body does not make enough insulin.
• Your body cannot use insulin properly (sometimes called insulin resistance).
• Illness, stress, or other health conditions can also temporarily raise blood sugar.
• Some medicines can raise blood sugar as a side effect.

Risk factors

• Having a parent, brother, or sister with diabetes
• Being overweight or carrying extra weight around your waist
• Being physically inactive
• Being over 40 years old
• Having high blood pressure or abnormal cholesterol levels
• Having had diabetes during pregnancy (gestational diabetes)
• Having polycystic ovary syndrome (PCOS)

When to see a doctor

See a doctor urgently if:

• If you have any of the emergency symptoms listed above, call your local emergency number immediately.
• If you have symptoms of very high blood sugar like vomiting, belly pain, or rapid breathing, seek same-day medical care.
• If you have diabetes and are sick and cannot keep food or fluids down, contact your healthcare provider today.

Book a routine appointment if:

• If you are 40 or older, ask your healthcare provider about screening.
• If you have any risk factors for diabetes, such as being overweight or having a family history, talk to your provider about a blood test.
• If you have symptoms like thirst and frequent urination, even if they seem mild, see your doctor.

Diagnosis

High blood sugar is diagnosed with a blood test. Your healthcare provider will draw a small sample of blood and measure the glucose level. You may need to fast (not eat or drink anything except water) for 8 hours before the test. Sometimes a repeat test is needed to confirm the diagnosis.

Tests that may be done

• Fasting blood glucose test – measures blood sugar after you have fasted.
• Random blood glucose test – measures blood sugar at any time of day.
• HbA1c test – shows your average blood sugar over the last 2 to 3 months.
• Oral glucose tolerance test – you drink a sugary drink, and blood samples are taken over a few hours.

What to expect at your appointment

A doctor or nurse will take a small amount of blood from your arm or a finger prick. It usually takes minutes. Results may come back the same day or after a few days. Your provider will explain what the numbers mean and, if your blood sugar is high, talk about next steps. You may be asked to have another test to make sure the result is accurate.

Treatment

Treatment for high blood sugar focuses on lowering your blood sugar to a healthy range and keeping it there. The best plan depends on your numbers, overall health, and personal goals. For many people, lifestyle changes such as healthier meals and more physical activity are enough at first. If not, medicines can help. Treatment is a partnership between you and your healthcare team.

Self-care at home

• Eat regular, balanced meals with a variety of vegetables, whole grains, and lean protein.
• Limit sugary drinks, sweets, and processed snacks.
• Aim to be physically active on most days, even a short walk after meals.
• Take any prescribed medicines exactly as your provider tells you.
• Check your blood sugar if your provider recommends it, and record your readings.
• Get enough sleep and find healthy ways to manage stress.

Medical treatments

If lifestyle changes are not enough, your doctor may recommend medicines to lower blood sugar. These medicines come in different forms, such as pills or injections. Some are taken once a day, others more often. Your healthcare provider will choose a treatment based on your needs. You may also be offered education on how to use blood sugar monitors or insulin if needed. Always talk to your provider before starting, stopping, or changing any medicine.

Living with this condition

Living with high blood sugar becomes easier over time. You will learn what makes your levels go up and down, and simple routines like regular meals and walking can make a big difference. Keep a daily routine, take your medicines as prescribed, and ask for help when you need it.

Lifestyle tips

• Follow a meal plan that fits your taste and culture.
• Take a short walk after breakfast, lunch, and dinner.
• Drink water instead of sugary drinks.
• Keep a regular sleep schedule.
• Check your blood sugar as advised and write down your numbers.
• Wear a medical alert bracelet or carry a card saying you have diabetes.

Diet and exercise

A balanced diet for blood sugar should include plenty of vegetables, fruits with skin, whole grains like oats or brown rice, lean proteins like chicken or beans, and healthy fats like olive oil. Avoid sugary drinks and foods with added sugar. Exercise is just as important: aim for at least 30 minutes of moderate activity like brisk walking, cycling, or swimming on most days. Start slowly and do what is safe for you.

Mental health and emotional wellbeing

It is common to feel worried, frustrated, or sometimes overwhelmed when managing a health condition. You may worry about complications or feel tired of checking your blood sugar and watching what you eat. These feelings are normal. Talk to your healthcare team, friends, or family about what you are going through. If you feel very depressed or have thoughts of harming yourself, reach out to a mental health crisis line or an emergency service right away.

Prevention

Type 2 diabetes and prediabetes can often be prevented or delayed. Keeping a healthy weight, eating a balanced diet, and staying physically active are the most effective ways. If you are at risk, ask your healthcare provider how you can lower your chances. Even losing a small amount of weight and being more active can have a big impact.

Screening programmes

Screening for high blood sugar is recommended for adults with risk factors. If you are 40 or older, or if you have risk factors like obesity, high blood pressure, or a family history of diabetes, talk to your provider about getting tested. If you had gestational diabetes during pregnancy, you should also be tested regularly.

Complications

If left untreated

• High blood sugar can damage the small blood vessels in your eyes, leading to vision problems.
• It can damage your kidneys and increase your risk of kidney failure.
• It can cause nerve damage, leading to pain, tingling, or numbness in your hands and feet.
• It raises your risk of heart attacks and strokes.
• Cuts and sores may heal slowly and become infected, sometimes leading to serious foot problems.

Long-term outlook

The outlook for people with high blood sugar is good when it is found early and managed well. Many people live long, healthy lives with diabetes. By working with your healthcare team, making healthy choices, and following your treatment plan, you can lower your risk of complications and feel more in control.

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