In case of the insulin resistance test, an oral glucose test is performed, in parallel with which the insulin level, the degree of secretion and its change are measured. In insulin-resistant individuals, in addition to blood glucose levels, insulin levels are also elevated.
It is recommended that a diet of 150 grams of carbohydrate be maintained for at least 3 days prior to the test, and a 12-hour fasting is required for the empty stomach blood draw prior to the test.
The test is performed in the morning on an empty stomach, with two or three samples as required. First, fasting blood is taken, followed by a blood sugar check. If the measured value is below 7.00 mmol/l, the test can be performed, at which point the patient should consume a sweet solution containing 75g of glucose. Then, in the case of a 3-point test, a blood sample is taken after 60 and 120 minutes, respectively, from which the glucose tolerance can be determined after the examination of the blood sugar level. At the same time, insulin levels and their changes are measured. In the case of a 2-point test, the second sampling takes place after 120 minutes.
The finding also includes the HOMA index calculated from fasting blood sugar and insulin values, the value of which is considered by your doctor when determining insulin resistance. A value of 2 already raises a suspicion of IR, however, this value alone is not sufficient to establish a diagnosis as it does not show a post-oral glucose tolerance test value.
When is the result expected?
After the 2nd working day following the test.
What to do after the laboratory test?
The result of the laboratory test alone does not qualify as a diagnosis, in the light of the symptoms and the measured values, the internal medicine specialist determines the existence of insulin resistance.
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