Pregnancy due date calculator – are they accurate ?
Due date calculators are generally considered accurate within 7 days. Typically, most practitioners don’t adjust due dates in either direction if the discrepancy between the two doable dates is less than 7 days. And that’s true even of primeval ultrasounds.
There are generally two ways of measuring a pregnancy, LMP (last menstrual period) and gestational. Most due date calculators go by LMP, which computes a pregnancy at 40 weeks or 10 lunar (4 week) months. LMP would mean that ovulation took place in your 2nd week of pregnancy (day 14). Gestational starts from the date of ovulation resulting in a 38 week pregnancy. So if you know the date of ovulation you can compute where you are by either LMP or gestational.
The ultrasound technology might give you an odd date because they might not use either of these; they sometimes take the rate of development and change the due date based on where on their scale the baby is. The Physician might even move the due date based on this, even if you know totally when the baby was conceived!
Babies only have so much doable size variability throughout pregnancy and so most will be of a certain size at a certain point in the pregnancy. The later in the pregnancy you are the more individual variability among babies there is and so the less accurate the size and date estimate will be. However, for example, nearly all babies will be 2 inches at 13 weeks (LMP) and apiece tiny bit larger than that they are, an extra day would get tacked on to an ultrasound estimate.
The solution is to compute the pregnancy due date and then, unless there are complications be ready primeval but figure on going late. Many people have their hearts set on their due date and are so ready on their due date that when it goes by and nothing. They get pretty upset.
Now that you’re pregnant, you probably want to know when your baby will arrive. This due date calculator video will explain how to compute when to anticipate your birth. Pregnancy.Healthguru.com
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