Dating your pregnancy
Dating your pregnancy - shaw discrepancies in olympiad dating
The terms preterm and postterm have largely replaced earlier terms of premature and postmature.Preterm and postterm are defined above, whereas premature and postmature have historical meaning and relate more to the infant's size and state of development rather than to the stage of pregnancy.
The chronology of pregnancy is, unless otherwise specified, generally given as gestational age, where the starting point is the woman's last normal menstrual period (LMP), or the corresponding age of the gestation as estimated by a more accurate method if available.Cell division continues at a rapid rate and the cells then develop into what is known as a blastocyst.The blastocyst arrives at the uterus and attaches to the uterine wall, a process known as implantation.Also during this time, there is development of structures important to the support of the embryo, including the placenta and umbilical cord.The placenta connects the developing embryo to the uterine wall to allow nutrient uptake, waste elimination, and gas exchange via the mother's blood supply.In the case of a multiple birth the gravida number and parity value are increased by one only.
Women who have never carried a pregnancy achieving more than 20 weeks of gestation age are referred to as nulliparous.The symptoms and discomforts of pregnancy are those presentations and conditions that result from pregnancy but do not significantly interfere with activities of daily living or pose a threat to the health of the mother or baby. Sometimes a symptom that is considered a discomfort can be considered a complication when it is more severe.For example, nausea (morning sickness) can be a discomfort, but if, in combination with significant vomiting it causes a water-electrolyte imbalance, it is a complication known as hyperemesis gravidarum.After the point of fertilization, the fused product of the female and male gamete is referred to as a zygote or fertilized egg.The fusion of male and female gametes usually occurs following the act of sexual intercourse.The rule estimates the expected date of delivery (EDD) by adding a year, subtracting three months, and adding seven days to the origin of gestational age.