A blood sugar level less than 140 mg/dL (7.8 mmol/L) is normal. A reading of more than 200 mg/dL (11.1 mmol/L) after two hours means you have diabetes. A reading between 140 and 199 mg/dL (7.8 mmol/L and 11.0 mmol/L) means you have prediabetes.
A reading above 300 mg/dL can be dangerous, according to the University of Michigan, which recommends immediately informing your doctor if you have two or more readings of 300 mg/dL in a row. In severe cases, very high blood sugar levels (well above 300 mg/dL) can result in coma.
If your blood sugar levels are consistently high (usually above 20 mmol/L in adults and above 14 mmol/L in children), you may have moderate to severe symptoms of high blood sugar.
If your blood sugar level is slightly high for a short time, emergency treatment won't be necessary. But if it continues to rise you may need to act fast to avoid developing diabetic ketoacidosis (DKA). If your blood sugar level is 15 mmol/l or more, you should check your blood or urine for ketones.
Target blood sugar levels differ for everyone, but generally speaking: if you monitor yourself at home – a normal target is 4-7mmol/l before eating and under 8.5-9mmol/l two hours after a meal. if you're tested every few months – a normal target is below 48mmol/mol (or 6.5% on the older measurement scale)
A normal pre-prandial (before meal) blood glucose level will be between 4 and 7 mmol/l. Aftereating (post-prandial) levels should be below 9 mmol/l when tested 2 hours after a meal.
What is high blood sugar? In general, a blood sugar reading of more than 180 mg/dL or any reading above your target range is too high. A blood sugar reading of 300 mg/dL or more can be dangerous. If you have 2 readings in a row of 300 or more, call your doctor.
What do my blood sugar numbers mean? Persistently high blood sugar usually means you have diabetes. If HbA1c is more than 48 mmol/mol or fasting blood glucose is more than 11 mmol/L, your blood sugar is high.
Hyperglycaemia is having too much glucose (sugar) in your blood. A blood glucose level above 15mmol/L is considered hyperglycaemia.
A blood sugar level below 70 mg/dL (3.9 mmol/L) is low and can harm you. A blood sugar level below 54 mg/dL (3.0 mmol/L) is a cause for immediate action. You are at risk for low blood sugar if you have diabetes and are taking any of the following diabetes medicines: Insulin.
If hypoglycemia becomes severe, you may not be able to safely swallow food or drink. By this point, your blood glucose level is less than 54 mg/dL—often below 40 mg/dL. You may feel very confused, pass out, or have a seizure. Without prompt treatment, severe hypoglycemia may lead to a coma or even death.
Diagnosis. Blood sugar levels that occur during a diabetic coma include: Blood sugar that is higher than 300 mg/dL two times in a row for no reason. Blood sugar that is low, less than 70 mg/dL, and the numbers don't increase after three treatments.
Hyperglycemia, the term for expressing high blood sugar, has been defined by the World Health Organisation as: Blood glucose levels greater than 7.0 mmol/L (126 mg/dl) when fasting. Blood glucose levels greater than 11.0 mmol/L (200 mg/dl) 2 hours after meals.
Hyperglycemia, also known as high blood sugar, is a serious problem for older adults, and it can have severe consequences when untreated. Adults over the age of 60 should try to maintain glucose levels between 100 to 140 mg/dL.
The dawn phenomenon
In the early hours of the morning, hormones, including cortisol and growth hormone, signal the liver to boost the production of glucose, which provides energy that helps you wake up. This triggers beta cells in the pancreas to release insulin in order to keep blood glucose levels in check.
A blood sugar level less than 140 mg/dL (7.8 mmol/L) is normal. A reading of more than 200 mg/dL (11.1 mmol/L) after two hours means you have diabetes. A reading between 140 and 199 mg/dL (7.8 mmol/L and 11.0 mmol/L) means you have prediabetes.
Before meals, the suggested target blood glucose range is 4.0 to 8.0 mmol/L. At 2 hours after meals, the range is 5.0 to 10.0 mmol/L.
Doctors suggest that a normal fasting blood sugar range is between 70–100 mg/dL (3.9–5.6 mmol/L). If your fasting blood sugar is consistently over 126 mg/dL (7 mmol/L), your doctor will diagnose diabetes. You can reduce your risk of high fasting blood sugar by eating your dinner earlier the night before.
People often experience headaches, dizziness, sweating, shaking, and a feeling of anxiety. However, when a person experiences diabetic shock or severe hypoglycemia, they may lose consciousness, have trouble speaking, and experience double vision.