1 Many obstetricians also use the term gestational age ( GA). The appropriate term for this method of dating is menstrual age, and this term is used exclusively in this chapter when referring to the duration of a pregnancy. However, classically and by current convention, obstetricians date pregnancies in menstrual weeks, beginning from the 1st day of the last normal menstrual period. Fetal age actually begins at conception, and an equivalent term is conceptional age. It is important to establish from the outset what is meant by the term menstrual age and why it is so important in clinical obstetrics. It is difficult to imagine a clinical problem encountered during a pregnancy in which an accurate menstrual age is not highly desired before proceeding with an appropriate management plan. Arguably, the single most useful piece of information that obstetric sonography provides is an accurate determination of menstrual age. ![]() Sonography provides an enormous amount of useful information to the practicing obstetrician.
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