Mital P, Hooja N, Mehndiratta K.et al15concluded, that the measurement of placental thickness is an important parameter for estimation of
fetal age. It is helpful in cases where the exact duration of pregnancy is not known (especially between the 22ndweek and 35th week) where the placental thickness almost matches with the gestational age.
A mathematical model for the estimation of human embryonic and
fetal age. Cell Transplant 5(4):453-464.
In patients with congenital malformations, it is usually possible to determine the
fetal age at which developmental arrest occurred.
In 1997, James Kroll and Ben Koerth compared the fetal crown-to-rump length data from four different
fetal age models from South Carolina, Michigan, and two in New York.
During each fifteen-to-twenty minute routine scan, sonographers search for a fetal heartbeat; note the position and number of fetuses; and assess
fetal age, size, development, and the expected due date by measuring parts of the fetus.
Regression analysis in normal weight and obese patients showed that both methods have the same predictive power in determining
fetal age.
Lyman and his team are now using the cell-culture system to address that question and to determine how the infection varies as a function of
fetal age, time of infection, amount of virus and pathway of infection.
If so here, the
fetal age would be two weeks less than the gestational age, e.g., 20 weeks gestational age would translate into 18 weeks
fetal age.
On the other hand, understanding normal fetal growth rates of the vertebral column, and between species, provide a basis for the establishing of reference values for evaluation of the maturation, regional differences in growth that influence overall body form, and estimation of
fetal age in ultrasonography.
Crown rump length has already been established as a highly valuable and trustworthy parameter in
fetal age estimation by showing a significant correlation with gestational age.
There was no
fetal age constraint for fetal echocardiography.
The first signs of their functioning were detected at 3-3.5 months of
fetal age. The first signs of thymus involution--an indicator of sexual maturity--were documented in a 1-month-old moose.