Obstetric dating scan
c) The Femur length (FL) 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.
There may be some discomfort from pressure on the full bladder.3.5 to 7 million cycles per second) are generally used for this purpose.They are emitted from a transducer which is placed in contact with the maternal abdomen, and is moved to "look at" (likened to a light shined from a torch) any particular content of the uterus.Dating with the CRL can be within 3-4 days of the last menstrual period.
(Table) 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.
Movements such as fetal heart beat and malformations in the feus can be assessed and measurements can be made accurately on the images displayed on the screen.
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