Diagnosis of diabetes : a test for glucose tolerance

What you need to know about the body's tolerance to glucose.

Although rarely used, oral test for glucose tolerance is the gold standard for the diagnosis of type 2 diabetes.

Currently, the test is often used to diagnose gestational diabetes.

How is

test Before the test, oral glucose tolerance patients fasted overnight (at least 8 but no more than 16 hours).

then checked in plasma glucose on an empty stomach.Thereafter, the patient received 75 grams of glucose (100 g for pregnant).There are several methods employed by obstetricians to perform this test, but the method described above, is the standard.

Usually glucose is in sweetened water, which is given to the patient to drink.Blood samples to determine concentration of glucose can be taken up to four times.

How reliable test

To obtain reliable results, the patient should be in good physical condition (not to have other illnesses, even the common cold).It should also be physically active (not lying, as an inpatient), and should not take medica

tions that affect blood glucose.

Within 3 days before the test, the patient should eat according to diet, eating foods high in carbohydrates (150-200 g per day).On the morning of the day of the test, you can not smoke and drink coffee.

as determined by

test During the classical oral tolerance test glucose concentration of sugar in the blood is determined 5 times for 3 hours.Some physicians limited taking two blood samples - prior to receiving a glucose solution, and 2 hours after it.

a healthy person, the blood glucose level rises rapidly, and then just as quickly decreased.In patients with diabetes glucose concentration increases more than usual, and decreases much more slowly.

concentration of glucose is between the normal and diabetic levels, indicative of impaired glucose tolerance (IGT).IGT does not mean that a person is sick with diabetes.Each year, only 1-5% of people whose test results showed impaired glucose tolerance, diabetes mellitus develops.

Weight loss and exercise can help people with IGT to bring glucose back to normal.As additional measures, aimed at preventing the development of diabetes, your doctor may prescribe drugs such as metformin (Glucophage).

Recent studies have shown that IGT - a risk factor for heart disease, so today the need for treatment for IGT - the subject of medical controversy.

how to evaluate test results

  • Normal reaction: glucose after 2:00 is less than 140 mg / dL (7.8 mmol / l) and the results of measurements for 2 hours is less than 200 mg / dL (11.1mmol / l).
  • Impaired glucose tolerance: the concentration of glucose on an empty stomach is less than 126 mg / dl (7 mmol / L), and after 2 hours after administration of glucose - from 140 to 199 mg / dl (7,8-11 mg / l).
  • Diabetes: two diagnostic tests are carried out on different days show increased blood glucose concentration.
  • Gestational diabetes is diagnosed in the presence of any two of the following symptoms: during the test (with taking 100 g glucose) in the blood plasma fasting glucose level above 95 mg / dl (5.3 mmol / L) after 1 hour - up to 180 mg/ dL (10 mmol / l) after 2 hours - over 155 mg / dl (8.6 mmol / l) or 3 hours - over 140 mg / dl (7.7 mmol / l).

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