Fasting blood glucose: when to perform a blood test?

The determination of fasting blood glucose is part of systematic metabolic assessments. It is therefore performed quite often in combination with cholesterol and triglyceride dosages in the blood.

In particular, it is necessary to perform a fasting glucose test to detect type 2 diabetes in:

  • overweight people,
  • hypertensives and
  • people with a history of diabetes in the family.
  • This test is also frequently prescribed to pregnant women, to detect a possible gestational diabetes.

Fasting blood glucose is prescribed by the general practitioner, or in the context of occupational medicine. She is reimbursed by Social Security.

Fasting blood glucose: interpret the results

It is always the doctor who must interpret the results of fasting blood glucose, to make a diagnosis of diabetes and possibly to prescribe other complementary examinations or a suitable treatment.

Normal values

In general, it can be said that normal values ​​of fasting glucose are between 0.70 and 1.10 g / l.

Limit values

If the values ​​are lower than 0.70 g / l, it is called hypoglycemia.
If, on the contrary, they are greater than 1.10 g / l, it is called glucose intolerance.

Attention, diabetes ...

A person is considered to be diabetic when two fasting blood glucose tests, taken two weeks apart, showed a glucose level equal to or greater than 1.26 g / l (or 126 mg / l).

Beware, fasting blood glucose in a diabetic patient is often higher than blood glucose at the end of the day, before the evening meal. This is simply related to the fact that the liver makes sugar during the night when one is diabetic.

Complementary examinations to be done

Once the fasting blood glucose level has been measured several times, in the case of glucose levels equal to or greater than 1.26 g / l, it is reasonable to assume that there is type 2 diabetes that develops or is in course.

In case of abnormal rates, it is advisable to make additional examinations.

An analysis of the glycated hemoglobin (HbA1c) will help to interpret the glycemic balance of the patient in the long term: this value gives an idea of ​​the whole blood glucose during the last three months.

10 things to know about diabetes

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> Diabetes: soon a tattoo to measure your blood sugar?
> What diet for diabetes?
> Sport and diabetes: what you need to know
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