What is the Difference Between Glucose Tests and Glucose?

A very common question that people often have is whether there is a difference between glucose and blood glucose tests.

However, according to doctors, the blood glucose test is used to measure blood glucose. The fasting blood glucose test represents the dosage after a fasting period, which can vary between 8 and 12 hours.

Blood glucose can also be performed without fasting, as is the case with postprandial blood glucose, which is taken after a meal.

What is the Fasting Glucose Test?

It is an exam that aims to measure the blood sugar level at the time it is being performed, and to diagnose hyperglycemia or hypoglycemia.

In addition, this test is also used to monitor the treatment of diabetic people, along with glycated hemoglobin, which is another type of test.

When is the blood glucose test requested?

Healthy diabetes 1 and 2 are the two main diseases associated with glucose measurement when their concentration is high. It is more rare for the doctor to order the test for a diagnosis of hypoglycemia. However, he can apply if necessary.

In addition, the doctor may also order the fasting blood glucose test even without the patient having any definite symptoms, through a routine check-up. After all, diabetes may not have any symptoms for a long time.

Blood Glucose Test

However, there are more common situations, which can lead the doctor to request a fasting glucose test, so that he can carry out a more complete and in-depth investigation, as in the case of the symptoms below, for example:

  • Intense thirst;
  • Dehydration;
  • Weight loss, even if you eat well;
  • Urinate often during the day;
  • Dizziness;
  • Blood glucose greater than 200mg / dl outside fasting;
  • Direct relative who has diabetes;
  • Nausea;
  • Comas or fainting;
  • Intense hunger,
  • Changing the dose or medication used to treat diabetes.

Is there a contraindication for the glucose test?

No. Taking the exam has no contraindications. However, it is necessary to take some precautions the day before the exam. Are they:

  • Children up to 3 years old can fast for 3 hours.
  • Children between 3 and 9 years old can fast for 4 to 5 hours.
  • In the case of other people, fasting should be at least 8 hours. Only water is allowed.
  • If the patient is being treated for diabetes, the 8 to 12 hour fast may not be accurate. The test should be done before the patient takes the next dose of insulin.
  • While you are fasting, you should avoid taking any medication, to avoid interfering with the test result.

For this, it is necessary to talk to the doctor beforehand, to make sure if it is possible or not to interrupt the medication. If the patient cannot interrupt the medication, this fact should be considered when evaluating the test result.

  • Routine feeding should be maintained until the moment of fasting begins.

Care The Day Before The Exam:

On the day before the exam, it is necessary to take some precautions, as shown below:

  • Alcohol intake;
  • Ingestion of large amounts of caffeine,
  • More vigorous physical exercises.

How is fasting glucose made?

After fasting, according to the time indicated for each age and for each case, blood will be collected in a blood laboratory by means of venipuncture. The blood tube is dosed in an automated equipment to allow the glycemia to be checked.

The result is usually obtained faster, and can vary between 30 minutes and 24 hours, according to the laboratory’s recommendations.

Fasting Glucose Results

What to do after the exam

After taking the exam, you can eat normally without overdoing it. However, the practice of more intense physical exercises is not recommended after a prolonged fast.

Does the Blood Glucose Test Cause Side Effects?

The test does not usually have side effects. However, due to the long period of fasting, it is possible that the person will feel dizzy, or some other common symptom after a long fast. These symptoms may be related to hypoglycemia. However, this is a condition that rarely happens in healthy people.

Are Risks and Complications Common?

The only risks associated with performing the fasting blood glucose test are the same for all blood tests, such as injuries from more complicated blood collection or bruising. In addition, the patient may also feel dizzy due to the fasting period.

How often is the exam?

Patients with type 1 and 2 diabetes should undergo the examination, on average, every 3 months. However, the periodicity may vary from one person to another, according to the need.

What will the result indicate?

The result of the blood glucose test will show whether or not the patient has a problem with hyperglycemia or hypoglycemia.

If the results shown are normal, slightly above or below the indicated, but close to the limit, the doctor may request that it be done on another date again. This will ensure that the numbers remain either above or below normal.

Can the Fasting Glucose Test be done on a Pregnant Woman?

Pregnant women should perform the fasting blood glucose test. In fact, this exam is a procedure that is part of the prenatal routine, which is the monitoring of the pregnant woman and the baby during the 9 months of pregnancy.

The exam can be done any week. However, pregnant women have different values ​​for fasting blood glucose. For a suspected diabetes, the upper limit is 85mg / dL.

If the result is altered, a test is performed, where the glycemic curve is administered for 60 to 120 minutes, after the pregnant woman ingests 75g of glucose. This test is done between 24 and 28 weeks of pregnancy.

If gestational diabetes is confirmed, frequent monitoring will be required. The pregnant woman who has gestational diabetes, or who already has diabetes before becoming pregnant, should keep her fasting blood glucose levels at approximately 95 mg / Dl.

And, one hour after meals, they should be around 140 mg / dL. If necessary, treatment with insulin should be started.


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