Since in the last trimenon no ultrasound examination is routinely used, when some sort of growth disturbance is suspected, the diagnosis must be made with the aid of clinical means and these must be performed at the right time. The measurement of the symphysis-fundus uteri distance (SFD) according to Westin has proved to be the best clinical standard (4). This extent approximates the crown-rump length of the fetus.
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