If the blood is drawn for fasting blood sugar, liver function and other items, drinking yogurt will affect the blood draw, but if it is used for routine blood tests, thyroid function and other tests, drinking yogurt usually has no effect.
For those who draw blood for fasting blood sugar, liver function and other items, it is usually necessary to fast for 8 to 12 hours before drawing blood. If you drink yogurt before the blood draw, it will affect the blood draw, and you need to postpone the blood draw, otherwise it will affect the test results.
If the blood is drawn for routine blood tests and thyroid function tests, which do not require fasting, drinking yogurt before the blood draw will not affect the blood draw.
Drinking yogurt will not necessarily affect the blood draw, which needs to be judged according to the test items.