The available evidence on mechanism of action, limited as it is, strongly indicates that levonorgestrol is a contraceptive, rather than an abortifacient; that is, it appears to prevent fertilization rather than preventing implantation of the fertilized ovum
The crucial distinction between mifepristone and emergency contraceptives is that the former eliminates a fertilized ovum
whereas the latter prevents the ovum from being fertilized.
Doctors would also be able to use donated ova and sperm to make a fertilized ova for transplant, and the transplant of a fertilized ovum
could be possible using frozen ova discarded from the treatment of other infertile couples, according to the report.
I believe that a fertilized ovum
is simply a single human cell, just like billions of others found in the body, each one with the potential of becoming a clone for a new human being.
These activities include promoting ovum growth and fertilized ovum
implantation, and are exhibited by a sole substance.
Spinnato stated that "the inhibition of implantation of the fertilized ovum
remains a major, if not the dominant mechanism of action of IUDs" (Am.
It is not permissible, however, to initiate or to recommend treatments that have as their purpose or direct effect the removal, destruction or interference with the implantation of a fertilized ovum
These hormones prepare the uterine lining for implantation of the fertilized ovum
An ectopic pregnancy occurs when a fertilized ovum
is implanted somewhere other than inside the normal uterine cavity.
Such a belief underlies the distinction many held between a fertilized ovum
and a body cell.
Returning to this point, this superficially appears to fall into the same category as that of an in vitro fertilized ovum
transplanted into a host mother, specifically where the donated egg is not one from the mother herself.
Thirty years later, it had been shown that if the fertilized ovum
of a test animal was divided in two, and if one of the resulting cells was killed with a hot needle, then the remaining cell would evolve into a longitudinal half of an embryo.
The drug, originally developed in France, is administered to women within 24-48 hours after intercourse before a fertilized ovum
becomes implanted in the uterus.
In 1986 Louisiana enacted legislation defining any "in vitro fertilized ovum
[as a juridical person].
INTRODUCTION: Cervical pregnancy is a type of ectopic pregnancy where the implantation of the fertilized ovum
occurs in the endocervical canal.