The precautions for pregnancy high blood sugar retest include paying attention to the diet before the test and not stopping medication without authorization. 1. Pay attention to the diet before the test: the day before the retest, patients with high blood sugar in pregnancy can ensure that they have three meals a day according to their usual habits, but they should not eat after 10:00 p.m., and they can drink a small amount of boiled water. In addition, patients must not diet excessively on the day before the test in order to get the ideal result, otherwise low blood glucose results may occur. 2. Do not stop taking medication without authorization: Before the retest, patients should not stop taking medication without authorization because of the fasting blood glucose test, because the test results thus obtained not only cannot accurately reflect the real changes in the condition, but also may cause fluctuations in blood glucose, or even aggravate the condition. If you need to undergo a retest of gestational hyperglycemia, it is recommended that you follow your doctor’s instructions on how to prepare for the retest, so as not to be unable to carry out the test properly and delay your condition.