rule of outlet

rule of outlet

n.

A rule for determining whether the pelvic outlet will allow the passage of a normal-sized fetus by calculating whether the sum of the posterior sagittal diameter and the transverse diameter of the outlet equal at least 15 centimeters.

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rule of outlet,

an obstetric standard for determining whether the pelvic outlet will allow the passage of a fetus. It is calculated from the sum of the transverse and posterior sagittal diameters of the outlet, which must equal at least 15 cm.