New charts for ultrasound dating of pregnancy www houstondatingservice com
(Chart and further comments) Similar to the BPD, dating using the FL should be done as early as is feasible.The single most important measurement to make in late pregnancy.The fetal pole is amass of cells before the embryo is visible.
The GS encloses not only the embryo, but also the amniotic fluid, which helps to nourish and protect the developing baby.
Fetal and obstetric ultrasound measurements reflect whether the fetus has grown enough or whether the measurements fall outside the normal range.
They also reflect if there are anomalies of the fetus.
The HCis usually done after 13 weeks of the pregnancy.
Measures the longest bone in the body and reflects the longitudinal growth of the fetus. It increases from about 1.5 cm at 14 weeks to about 7.8 cm at term.
An important point to note is that when the due date has been set by an accurately measured CRL, it should not be changed by a subsequent scan. It increases from about 2.4 cm at 13 weeks to about 9.5 cm at term.