Glucose Tolerance Test is the injection of glucose to determine how quickly cleared away from the blood. The purpose of undertaking the investigation is to determine the diabetic condition, insulin resistance and sometimes also hypoglycemia. The glucose is generally fed on the mouth so that the common test becomes Oral Glucose Tolerance Test. The investigations or the tests are performed on a routine basis. This mode of investigation is called the Comprehensive Metabolic Panel.
There are some precautions undertaken during the Glucose Tolerance Test for pregnancy. The patient is advised not to reduce the amount of carbohydrate intake in the particular day of the test or weeks prior to the test. If the pregnant mother suffers from any type of illness, this test should be strictly avoidable. Even if the test is conducted during the time of illness, the pregnant mother’s glucose metabolism will not show a glaring picture even if when the mother becomes slightly healthy. To a pregnant mother, whose weight is less than 43 kilogram, full adult dosage cannot be applied. Alternatively if high dosage is applied then the result might turn out grim.
To undergo the Pregnancy Glucose Tolerance Test, the patient should be in fast during the past 8-14 hours. Only water is allowed. The test begins in the morning hours. The time is approximately within 0700 am to 0800 am. This is because the glucose tolerance exhibits a diurnal rhythm with a quite a good amount of decrease during the afternoon period. Then a zero time blood sample is drawn. The patient is again given glucose solution to drink.
Blood is taken at regular intervals for measurement of glucose and sometimes even insulin levels. However there might be variation in the number of samples as per the investigation is concerned. During renal glycosuria (excretion of sugar in the urine despite normal levels in the blood) urine samples of are taken for test along with the fasting and tow hour blood tests.
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