How high is too high for blood sugar levels and 4 steps to check at home!

Glucose levels, also known as blood sugar levels, are an important indicator for monitoring and managing diabetes. They indicate the amount of glucose in the blood at a specific time. However, do you know How high is too high for blood sugar levels? This article will provide you with information on safe and dangerous blood sugar levels, while also warning of complications caused by high blood sugar.


Blood sugar is the primary source of energy, but how high is too high? The answer will help you actively prevent and limit the progression of diabetes. Let’s find out now!

How high is too high for blood sugar levels?

To assess blood sugar status, doctors conduct tests at two intervals:

Fasting blood sugar danger:

Normal: < 100 mg/dL Prediabetes: 100 – 125 mg/dL

Diabetes: ≥ 126 mg/dL

Postprandial blood sugar danger:

Normal: < 140 mg/dL

Chi-so-tieu-duong-bao-nhieu-la-nguy-hiem-1 How-high-is-too-high-for-blood-sugar-levels

What diabetes index is dangerous? – When the index is higher than 200 mg/dL after eating

How high is too high for blood sugar levels? – When levels exceed 200 mg/dL after eating

Prediabetes: 140 – 199 mg/dL Diabetes: ≥ 200 mg/dL Acute risks when blood sugar is not at a safe level: Severe hypoglycemia (below 54 mg/dL): Causes trembling, dizziness, and in severe cases, seizures, and unconsciousness. Severe hyperglycemia (over 300 mg/dL): Leads to diabetic ketoacidosis, diabetic coma, life-threatening.

Complications of prolonged high blood sugar in diabetes

According to the American Diabetes Association, chronic high blood sugar damages organs, leading to:

Cardiovascular diseases: Increased risk of coronary artery disease, stroke. Kidney disease. Nerve damage. Blindness. Skin infections, slow wound healing, increased risk of amputation.

Recognizing signs of high blood sugar levels Constant thirst. Frequent urination, including at night. Unintended weight loss. Persistent fatigue. Blurry vision. Slow-healing wounds.

When should blood sugar be checked at home?

Checking blood sugar at home helps effectively monitor the condition. You should consider it if:

Diagnosed with diabetes High risk: Family history, overweight or obese, lack of exercise… Experiencing the symptoms mentioned above.

How to check blood sugar at home Prepare the necessary equipment. Clean hands thoroughly. Take a blood sample following instructions. Read the result and carefully record it.

Measuring blood sugar at home can be effective

Preventing high blood sugar levels Healthy eating: Limiting bad fats, refined sugars, increasing fiber from fruits and vegetables.


Limiting bad fats, refined sugars, and increasing fiber from fruits and vegetables

Regular exercise. Weight management. Stress management. Regular health check-ups.

Effective treatment for high blood sugar

Depending on the severity of high blood sugar levels, doctors may recommend:

Lifestyle changes. Use of blood sugar-lowering medications. Insulin injections (if necessary).


Blood sugar measurement can be done effectively at home

Expert Advice

Actively monitoring blood sugar levels helps protect overall health. Adherence to treatment and follow-up appointments as directed by the doctor are essential.


Knowing how high blood sugar levels are considered dangerous will encourage you to take positive action. Building a healthy lifestyle, combined with regular medical check-ups, is the key to controlling blood sugar levels and preventing diabetes complications.

Note: This article is for reference purposes only and does not replace advice from a specialist physician.

What fasting blood sugar level indicates diabetes?

Answer: Fasting blood sugar levels of 126 mg/dL (7 mmol/L) or higher, confirmed on different days, indicate diabetes.

What postprandial blood sugar level is considered high?

Answer: 1-2 hours after eating, blood sugar levels exceeding 180 mg/dL (10 mmol/L) are considered high. Repeatedly high postprandial blood sugar levels may indicate diabetes.

At what blood sugar level should one go to the hospital?

Answer: Emergency hospitalization is necessary when:

Blood sugar is extremely low (below 54 mg/dL) with symptoms such as fainting, seizures… Blood sugar is extremely high (over 300 mg/dL) and persists, especially with symptoms like nausea, vomiting, severe abdominal pain, difficulty breathing (suspected diabetic ketoacidosis, diabetic coma).

Is unstable blood sugar dangerous?

Answer: Unstable blood sugar, fluctuating between high and low levels, is very dangerous. This condition increases the risk of acute complications (such as severe hypoglycemia, severe hyperglycemia) and long-term complications of diabetes.

How to quickly lower blood sugar at home?

Answer: When blood sugar is high, in addition to taking prescribed medications correctly, you can apply some methods to quickly lower blood sugar levels such as:

Drink plenty of water. Take a gentle walk or engage in suitable exercise for about 15 minutes. Do not skip meals, limit sugary and starchy foods.

Note: Always consult a doctor for safe blood sugar control, especially in managing home treatments for abnormally low or high blood sugar levels. Do not self-administer methods to quickly lower blood sugar found on the internet without accurately determining the cause of high blood sugar.

The document “Acute complications of diabetes” from the Central Endocrinology Hospital:

Hypoglycemia: Below 54 mg/dL, may cause trembling, dizziness, seizures, unconsciousness. Hyperglycemia: Above 300 mg/dL, prolonged leads to diabetic ketoacidosis, diabetic coma, life-threatening.

The document “Chronic complications of diabetes” from the University of Medicine and Pharmacy, Ho Chi Minh City:

Nerve damage: Causes numbness, pain, sensory disorders, foot ulcers. Eye damage: Blurred vision, cataracts, even blindness. Diabetic kidney disease: End-stage renal failure.

This article has provided information on “How high is too high for blood sugar levels” and related knowledge. Hopefully, the article will be helpful to you.

Kiểm Duyệt Nội Dung

Ban Biên Tập | Website

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