Of the weight loss surgeries currently available, gastric sleeve, or sleeve gastrectomy, is a safe choice with less side effects than other types that transitions well into later surgeries if need be. But how does this popular procedure work? Gastric Sleeve Basics. A sleeve gastrectomy is performed laparoscopically using a small incision.
How to Calculate Gestational Age. 1  Find the date of the first day of your last menstrual period on a calendar. 2  Count the number of full weeks that have passed from the date in Step #1 to today's date. For example, if your last menstrual period started on July 1st and today's date is August 1st, the gestational age is 4 weeks.
These markers are used to measure the gestational sac and the length between the crown (head) and rump. If the ultrasound is performed after the 6th week gestation, the length of the fetus from crown to rump is added to 6 weeks to determine gestational age. For instance, if the crown rump measurement is 21 mm, the gestational age of the fetus is 9 weeks. (6 weeks plus 21 days = 9 weeks.) If an ultrasound is performed before the 6th week gestation, age is determined based on other factors, including size of the fetus and development of the gestational sac.