Is it necessary to sift sugar? When is the sugar sifting done? It is necessary to do it. Sugar screening is the abbreviation of gestational diabetes screening. It is usually done between 24 and 28 weeks of pregnancy. The screening method of sugar screening is: fast for 12 hours, dissolve 50 grams of glucose powder in 200ml of water, drink it within 5 minutes, start timing from the first sip, draw blood to check blood sugar after 1 hour, the blood sugar value is ≥7…