If a pregnant woman wants to check her thyroid function, it is recommended that fasting is best, as thyroxine levels are more stable in a fasting state, so the results will be more accurate, so it is recommended that blood be drawn on an empty stomach for thyroid function. In addition to thyroid function, fasting is recommended for blood glucose, liver and kidney function, and bile acids. Fasting is also recommended for Down’s syndrome screening because the hormone levels in the body are more stable in a fasting state and the results are less likely to be disturbed, so it is better to do it on an empty stomach. If thyroid function is found to be abnormal, it is important to follow up with the internal medicine clinic regularly and if necessary, medication is needed.