Failure to pass Down’s screening has nothing to do with eating.
Down’s syndrome is a screening test that detects the risk of trisomy 21, trisomy 18 and open neural tube anomalies in the fetus. Down’s syndrome is calculated by taking blood from the vein of a pregnant woman, testing the values of alpha-fetoprotein and human chorionic gonadotropin in the blood and combining them with the woman’s age, body weight and gestational week of the time when the blood is taken, to arrive at the risk factor of having a Down’s syndrome child, and there is no relationship between these indicators and fasting.
The Down’s syndrome test has nothing to do with eating, so you don’t need to fast to have your blood drawn. Even if you don’t have an empty stomach when the blood is taken, you don’t have to worry about it affecting your Down’s results.