Gestational Age - Methods

Methods

Some countries count gestational age from fertilization instead of LMP. This method of counting is also known as fertilization age, embryonic age, fertilizational age or (intrauterine) developmental (IUD) age. This method is more prevalent in descriptions of prenatal development of the embryo or fetus. The LMP gestational age is usually greater by about two weeks. Also, pregnancy often is defined as beginning with implantation, which happens about three weeks after the LMP (see the beginning of pregnancy controversy).

Read more about this topic:  Gestational Age

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