<Li> Determination of which time point is to be used as the origin for gestational age . This starting point is the woman 's last normal menstrual period ( LMP ) or the corresponding time as estimated by a more accurate method if available . Such methods include adding 14 days to a known duration since fertilization ( as is possible in in vitro fertilization ) , or by obstetric ultrasonography . </Li>
<Li> Determination of which time point is to be used as the origin for gestational age . This starting point is the woman 's last normal menstrual period ( LMP ) or the corresponding time as estimated by a more accurate method if available . Such methods include adding 14 days to a known duration since fertilization ( as is possible in in vitro fertilization ) , or by obstetric ultrasonography . </Li>
when do many obstetricians date the onset of pregnancy from
when do many obstetricians date the onset of pregnancy from
the woman 's last normal menstrual period ( LMP )
the woman 's last normal menstrual period ( LMP )