If the examination program requires fasting but ate a mouthful of steamed bread usually need to re-examine, if the examination program does not require fasting does not require special treatment, it is recommended to consult the doctor to check the requirements of the program. For the detection of fasting blood glucose, liver function, lipids and other indicators have strict dietary requirements, the need to maintain overnight fasting in the case of extracting blood for testing the next morning, i.e., at least to maintain a fasting 8 to 10 hours, such cases if the food may affect the results of the test, resulting in inaccurate values, not conducive to the doctor to determine the condition, it is recommended to re-select the time to measure. If the thyroid function test, glycated hemoglobin and other tests do not require fasting, eating food at this time will not generally have a greater impact on the test results, so there is no need for special treatment. If you are not sure whether eating a mouthful of steamed bread on an empty stomach will have an effect on the test results, it is recommended to consult a professional doctor.