The amylum (starch) tolerance test (ATT) tests the function of the pancreas when starch (amylum) is delivered to the body.
The test is performed on 2 consecutive days. On the first day, 5 blood samples are taken, the first on empty stomach, followed by the consumption of a solution containing 75 grams of glucose, and then after 30, 60, 90, and 120 minutes, another blood sample is taken to monitor the development of blood sugar levels.
On the second day, 4 samples are taken: the first is also on empty stomach, followed by 3 additional blood samples half an hour apart. After the empty stomach sampling, the patient should consume a solution containing 75 grams of wheat starch. Half-hourly blood sampling monitors the change in blood sugar levels, as amylase enzyme is needed for the breakdown starch, and successful breakdown involves an increase in blood sugar levels.