At 28 weeks to 30 weeks for a mini-detectoral examination, it is usually just a basic ultrasound and usually does not require fasting. However, fasting is required when liver function or blood glucose are checked at the same time. The concept and the timing of the ultrasound varies from hospital to hospital. If you have a micro-anomaly at 28 to 30 weeks of pregnancy, it is usually a general ultrasound examination to confirm the results of the previous macro-anomaly, and to clarify whether there are any developmental abnormalities or other problems in the fetus. If this is the case, no fasting is required for this test. However, if the doctor prescribes other items at the same time, such as blood tests for liver function or blood glucose, you need to go to the hospital on an empty stomach, so we recommend that you consult the doctor who prescribes the test directly for specific precautions.