EDD (Expected Date of Delivery) calculating calendar

Abstract

ABSTRACT Our Invention “EDD (Expected Date of Delivery) calculating calendar “ is a Because the human egg is capable of fertilization for only 12 to 24 hours after ovulation the date of ovulation may be taken as being the date of conception. However, ultrasound determination of the date of ovulation has the same imprecision as does the ultrasound estimate of the gestational age and, therefore, a precise date of conception cannot usually be determined as with in vitro fertilization.In addition, although a woman is most likely to become pregnant if she has sex on the day of ovulation conception may also occur from live sperm still in her reproductive tract on the day of ovulation if she had sex for up to five days before ovulation. An average pregnancy lasts 280 days from the first day of the last menstrual period (LMP) or 266 days after conception. Historically, an accurate LMP is the best estimator for determining the due date. Naegele’s rule, derived from a German obstetrician, subtracts 3 months and adds 7 days to calculate the estimated due date (EDD). The obstetrician should get a detailed menstrual history, including duration, flow, previous menstrual periods, and hormonal contraceptives. These factors are used to determine the length of her cycles and ovulation period. There are several fallacies with Naegele’s rule. First, a woman may not accurately recall the first day of her menstrual cycle. Second, this method assumes a woman’s cycle is exactly 28 days, with ovulation occurring at day 14, however, it does not consider menstrual cycles with shorter or longer durations. Third, there are small variations in the duration between fertilization and blastocyst implantation. Last, this method cannot differentiate between menstrual bleeding and early pregnancy bleeding. Parikh’s formula was created to account for differences in menstrual cycle length. Parikh’s formula calculates EDD by adding nine months to the start of the last menstrual period, subtracting 21 days, then adding the duration of the previous cycle.

Specification

Description:FIELD OF THE INVENTION
Our Invention is related to a EDD (Expected Date of Delivery) calculating calendar.

BACKGROUND OF THE INVENTION
The estimated due date (EDD or EDC) is the date that spontaneous onset of labor is expected to occur. The due date may be estimated by adding 280 days ( 9 months and 7 days) to the first day of the last menstrual period (LMP).

This is the method used by "pregnancy wheels". The accuracy of the EDD derived by this method depends on accurate recall by the mother, assumes regular 28 day cycles, and that ovulation and conception occurs on day 14 of the cycle. Use of the LMP to establish the due date may overestimate the duration of the pregnancy, and can be subject to an error of more than 2 weeks.

In cases where the date of conception is known precisely, such as with in vitro fertilization, the EDD is calculated by adding 266 days to the date of conception.
Ultrasound uses the size of the fetus to determine the gestational age (the time elapsed since the first day of the last menstrual period.

The accuracy of the ultrasound estimate of the gestational age varies according to the gestational age. "Ultrasound measurement of the embryo or fetus in the first trimester (up to and including 13 6/7 weeks of gestation) is the most accurate method to establish or confirm gestational age.

The Society of Obstetricians and Gynaecologists of Canada recommends the earliest ultrasound with a crown rump length equivalent to at least 7 weeks (or 10 mm) should be used to determine the gestational age.

The American College of Obstetricians and Gynecologists recommends that ultrasound-established dates should take preference over menstrual dates when the discrepancy between ultrasound dating and LMP is
• Greater than 5 days before 9 0/7 weeks of gestation by LMP
• Greater than 7 days from 9 0/7 weeks to 15 6/7 weeks by LMP
• Greater than 10 days from 16 0/7 weeks to 21 6/7 weeks by LMP
• Greater than 14 days from 22 0/7 weeks to 27 6/7 weeks by LMP
• Greater than 21 days after 28 0/7 weeks by LMP

SUMMARY OF THE INVENTION
Because of the risk of redating a small fetus that may be growth restricted, management decisions based on third-trimester ultrasonography alone are especially problematic.

They need to be guided by careful consideration of the entire clinical picture and may require closer surveillance, including repeat ultrasonography to ensure appropriate interval growth.

BRIEF DESCRIPTION OF THE DIAGRAM
Fig.1: EDD (Expected Date of Delivery) calculating calendar
Fig.2: EDD (Expected Date of Delivery) calculating calendar Table
Fig.3: EDD (Expected Date of Delivery) calculating calendar Display
DESCRIPTION OF THE INVENTION
Clinical Examination

A pelvic examination supported by good menstrual records in the first trimester has been reported to be a reliable method for dating of pregnancy.

Doppler Ultrasonography

The fetal heart can be heard using Doppler ultrasound by 10 to 12 weeks in most patients. The gestational age should, therefore, be at least 10 to 12 weeks if fetal heart tone are heard.

Human Chorionic Gonadotropin Pregnancy Test

Human chorionic gonadotropin first becomes detectable in the mother's blood and urine between 6 and 14 days after fertilization (3 to 4 weeks gestational age). The gestational age would, therefore, be at least 3 to 4 weeks at the time of a reliable hCG pregnancy test.
Twins

When a twin pregnancy is the result of in vitro fertilization determination of gestational age should be made from the date of embryo transfer. Otherwise "...to avoid missing a situation of early intrauterine growth restriction in one twin, most experts agree that the clinician may consider dating pregnancy using the larger fetus.

Observed Gestational Age at Delivery
The table below shows the average age of infants delivered in the United States according to the number of fetuses being carried (plurality) [29].
Singleton Twins Triplets Quadruplets Quintuplets and
higher-order multiples
Average Gestational Age (weeks) 39 35 32 30 27
The earlier age at delivery of multiple gestations is a reflection of the increased incidence of preterm labor and obstetric intervention for complications such as preeclampsia, abruptio placentae, fetal growth restriction, and increased risk for stillbirth that occurs as the number of fetuses increases.

The tendency for multiple gestations to be delivered earlier than singleton pregnancies should not be interpreted that multiples should be assigned an earlier estimated due date. A full term pregnancy is considered to be 39 to 40 6/7 weeks regardless of the number fetuses being carried
, Claims:WE CLAIMS

1) Our Invention "EDD (Expected Date of Delivery) calculating calendar " is a Because the human egg is capable of fertilization for only 12 to 24 hours after ovulation the date of ovulation may be taken as being the date of conception. However, ultrasound determination of the date of ovulation has the same imprecision as does the ultrasound estimate of the gestational age and, therefore, a precise date of conception cannot usually be determined as with in vitro fertilization. In addition, although a woman is most likely to become pregnant if she has sex on the day of ovulation conception may also occur from live sperm still in her reproductive tract on the day of ovulation if she had sex for up to five days before ovulation. An average pregnancy lasts 280 days from the first day of the last menstrual period (LMP) or 266 days after conception. Historically, an accurate LMP is the best estimator for determining the due date. Naegele's rule, derived from a German obstetrician, subtracts 3 months and adds 7 days to calculate the estimated due date (EDD). The obstetrician should get a detailed menstrual history, including duration, flow, previous menstrual periods, and hormonal contraceptives. These factors are used to determine the length of her cycles and ovulation period. There are several fallacies with Naegele's rule. First, a woman may not accurately recall the first day of her menstrual cycle. Second, this method assumes a woman's cycle is exactly 28 days, with ovulation occurring at day 14, however, it does not consider menstrual cycles with shorter or longer durations. Third, there are small variations in the duration between fertilization and blastocyst implantation. Last, this method cannot differentiate between menstrual bleeding and early pregnancy bleeding. Parikh's formula was created to account for differences in menstrual cycle length. Parikh's formula calculates EDD by adding nine months to the start of the last menstrual period, subtracting 21 days, then adding the duration of the previous cycle.

2) According to claim1# the invention is to a "EDD (Expected Date of Delivery) calculating calendar " is a Because the human egg is capable of fertilization for only 12 to 24 hours after ovulation the date of ovulation may be taken as being the date of conception.
3) According to claim1,2# the invention is to a average pregnancy lasts 280 days from the first day of the last menstrual period (LMP) or 266 days after conception. Historically, an accurate LMP is the best estimator for determining the due date. Naegele's rule, derived from a German obstetrician, subtracts 3 months and adds 7 days to calculate the estimated due date (EDD).
4) According to claim1,2,3# the invention is to a obstetrician should get a detailed menstrual history, including duration, flow, previous menstrual periods, and hormonal contraceptives. These factors are used to determine the length of her cycles and ovulation period. There are several fallacies with Naegele's rule.
5) According to claim1,2,3# the invention is to a woman may not accurately recall the first day of her menstrual cycle. Second, this method assumes a woman's cycle is exactly 28 days, with ovulation occurring at day 14, however, it does not consider menstrual cycles with shorter or longer durations. Third, there are small variations in the duration between fertilization and blastocyst implantation.
6) According to claim1,2,3,4# the invention is to a method cannot differentiate between menstrual bleeding and early pregnancy bleeding. Parikh's formula was created to account for differences in menstrual cycle length. Parikh's formula calculates EDD by adding nine months to the start of the last menstrual period, subtracting 21 days, then adding the duration of the previous cycle.

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