Measurement of Chest/Trunk Length Ratio
(C/T)

Measurements is performed on the sagittal section of the thorax and abdomen.

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normal fetus

C/T=CL/TL (normal:0.38}0.03)
CL: chest length (from the top of the thorax to the top of the diaphragm), TL: trunk length (from the top of the thorax to the bottom of the bladder)