Inaccurate dating of the pregnancy

Ultrasounds performed after 22 weeks gestation cannot be used to estimate the due date of the baby because the size no longer reflects the age very well.Even average babies can differ by up to 2 to 3 "weeks of growth";.the baby and its heart beat can be detected relatively easily with trans-abdominal and trans-vaginal examination.This is presuming that the pregnancy is actually at this stage of development.

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The AFP results will help your doctor determine if you need further tests for these conditions.A positive test doesn’t necessarily mean your unborn baby will have a birth defect.The AFP test is especially important for women who are at high risk of having children with birth defects, including women: If you aren’t pregnant, an AFP test can help to diagnose and monitor certain liver conditions, such as liver cancer, cirrhosis, and hepatitis.The EDD from the early dating scan is used - if the last menstrual period is not known or is unreliable, or the dating scan differs from the last menstrual period dating by more than 5 days.As the baby gets bigger, it starts to express its individual growth potential.

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