![]() ![]() If the margin of error is smaller than the difference, use the ultrasound date as your due date. ![]() If the margin of error is bigger than the difference in days between the due dates, use the LMP date as your due date. ![]() Now compare the results from the previous two steps: * GA in days as determined by your first ultrasound You can use a simple formula to figure it out: Calculate the margin of error. The Rule of Eights is based on a pretty consistent 8 percent margin of error found at any gestational age (GA). Later, you’ll compare that number to the margin of error, which is calculated by using the Rule of Eights.Ģ. First, determine the difference in days between the LMP and ultrasound due dates. To determine an accurate due date, you can use the “Rule of Eights.”ġ. How do you determine which is more accurate? You can calculate your due date by last menstrual period (LMP) or by ultrasound, and the two calculation results might be different. More About Due Date Calculations The Rule of Eights: Due Date by last menstrual period or ultrasound? Click the “Calculate my due date” button and check your results. Now, the calculator will determine your due date by adding the remaining length of a typical pregnancy (in days) to how far along you are in your pregnancy (current gestational age).ģ. Insert the week and day of your pregnancy that was estimated by the ultrasound - this is the gestational age of the fetus or how far you are in your pregnancy. Insert the date when you had your ultrasound in the “Date of ultrasound” field.Ģ. To calculate your due date using the Flo calculator, follow these steps:ġ. The first ultrasound, done between 10 and 14 weeks, is considered the most accurate method of estimating when you conceived. The ultrasound can detect the fetus’s heartbeat around the 6th week, and this is one of the ways your health care provider can tell how far along you are in your pregnancy. They use high-frequency sound waves to get an image of the fetus to check fetal development and the progress of your pregnancy. Ultrasound (or sonogram) scans are totally painless and safe. How to determine pregnancy due date using ultrasound results
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