When 39mg/dL is converted to mmol/L we get 2.2mmol/L. A fasting blood sugar (blood glucose) of 2.2mmol/L is considered very low for a healthy adult.
To convert 39mg/dL to mmol/L, divide by 18.018. For example, 39mg/dL / 18.018 = 2.2mmol/L.
A fasting blood sugar (blood glucose) of 2.2mmol/L is considered abnormal for a healthy adult. A blood sugar level of 2.9mmol/L or less is very low. A healthy adult may occasionally get near this level when asleep but it would be unusual to have blood sugar this low when awake. If you did, there's a good chance you would have symptoms of low blood sugar.
A fasting blood sugar (blood glucose) of 2.2mmol/L is considered abnormal for a child. A fasting blood sugar level of 3.9mmol/L or less is low. A child may occasionally get near this level when asleep and fasted but it would be unusual to have blood sugar this low when awake. Children with a blood sugar level of under 70mg/dL may have symptoms of low blood sugar such as shaking, sweating, hunger, headache, looking pale or being confused. In a child with diabetes a blood sugar less than 70mg/dL would be considered a hypo.
A fasting blood sugar (blood glucose) of 2.2mmol/L is considered abnormal for someone with diabetes. A fasting blood sugar level of 3.9mmol/L or less is low. A diabetic with a blood sugar level of under 70mg/dL would likely have symptoms of low blood sugar such as shaking, sweating, hunger, headache, looking pale or being confused. Anyone with diabetes and a blood sugar this low should be aware of how to treat a hypo.
A fasting blood sugar (blood glucose) of 2.2mmol/L is considered abnormal for someone during pregnancy. A fasting blood sugar level of 3.9mmol/L or less is low. A pregnant person with a blood sugar level of under 3.9mmol/L may have symptoms of low blood sugar such as shaking, sweating, hunger, headache, looking pale or being confused. They should seek medical attention and ensure they eat something.
Hypoglycemia is when blood sugar levels are too low - typically below 3.9mmol/L. Symptoms of hypoglycaemia include shaking, sweating, hunger, headache, looking pale or being confused. A blood sugar of 2.2mmol/L is usually considered hypoglycemia, particularly in people with diabetes.
Hyperglycemia is when there’s too much glucose in the blood - typically above 11mmol/L 2 hours after a meal or above 6.9mmol/L when fasted. A fasting blood sugar of 2.2mmol/L is not usually considered hyperglycemia.
In general, you should see a doctor if you're having high or very low blood sugar levels. It's unusual for non-diabetics to get very low blood sugar level because the body doesn't let glucose levels get too low because glucose is essential for brain function. A blood sugar of 2.2mmol/L is very low and you should have something to eat or drink to raise your blood sugar and consider seeing a doctor, particularly if you have diabetes.