Femoral length (FL): The ossified femoral diaphysis (107) is easily measured: The upper leg (108) should be as close as possible to the probe and oriented lengthwise, thus perpendicular to the axis of the probe (Fig. 65.2). Measuring the length of the remaining tubular bones to exclude growth retardation or malformation is only necessary if the FL falls outside the reference range or if the percentile changes on sequential examinations.
Abdominal circumference (AC): The reference plane (Fig. 65.3) is the level of the liver (9), possibly with visualization of the dorsal third of the umbilical and portal veins (11).
The bilateral ribs should be displayed symmetrically to as sure that the section was not obtained in an oblique plane.
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