Definition of Pregnancy
• NIH/FDA
– “Pregnancy encompasses the period of time from
confirmation of implantation until expulsion or
extraction of the fetus.”
• ACOG
– “Pregnancy is the state of a female after
conception and until termination of the gestation.”
– “Conception is the implantation of the blastocyst. It
is not synonymous with fertilization; synonym:
implantation.”
US Government 1983
 Hughes ACOG 1972