placental sign

pla·cen·tal sign

slight endometrial oozing of blood that occurs in certain animals and sometimes in women at the time of implantation of the fertilized ovum; in women, if the blood appears externally it may be mistaken for a scanty menstrual period.
References in periodicals archive ?
Chorangiosis: an important placental sign of neonatal morbidity and mortality.
Whatever its cause, it should be considered as a placental sign of potential clinical significance.
100) The placenta features a high reserve capacity so that placental signs of fetal hypoxia are far less common than are those of pure placental hypoxia.
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