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One of the most important aspects of obstetrical care is to date, as precisely as possible, the beginning of pregnancy so that the estimated time of arrival ETA can be calculated sometimes referred to as the estimated date of confinement — EDC. And yet, even with all of the available technology, one of the puzzles of modern obstetrics, is that the obstetrician has not yet learned how to accurately date the beginning of a pregnancy.

Pregnancy can be measured in two different ways. The most common and most often used in clinical obstetrics is the measurement of the gestational age of the pregnancy. The gestational age of the pregnancy is measured from the first day of the last menstrual period. In this way of dating the pregnancy, the pregnancy is 40 weeks in duration on average instead of the actual 38 weeks. In other words, it dates the pregnancy, on average, two weeks longer than it is.

The other way of measuring the dates of the pregnancy is to measure the fetal age. The fetal age of the pregnancy is measured from the time of conception or the estimated time of conception ETC. When measuring the pregnancy in this fashion, it will be 38 weeks long or two weeks shorter than the gestational age dates.

What is the purpose of the dating scan?

The fetal age, of course, is the actual age of the pregnancy. You can ask your midwife or doctor before the scan if this is the case.

Antenatal Care: Confirming and Dating Pregnancy – Obstetrics - Lecturio

Find out more about what happens during a pregnancy ultrasound scan. Some abnormalities may also be detected at this scan, such as neural tube defects spina bifida is a type of neural tube defect.

Dating the Beginning of Pregnancy

Screening for Down's syndrome will happen at the dating scan if:. The screening test for Down's syndrome used at this stage of pregnancy is called the "combined test". It involves a blood test and measuring the fluid at the back of the baby's neck nuchal translucency with an ultrasound scan. This is sometimes called a nuchal translucency scan.

The nuchal translucency measurement can be taken during the dating scan.

Pregnancy Due Date Calculator, Obstetric Calculator | Patient

Find out more about the combined screening test for Down's syndrome. You won't be offered the combined screening test if your dating scan happens after 14 weeks. Your partner is welcome to come into the room with you, but as this is a medical diagnostic ultrasound, we do like to limit the number of people who come into the room.


  1. Page contents!
  2. Women's Health Care Physicians.
  3. Obstetric (Pregnancy)?
  4. Dating the Beginning of Pregnancy.
  5. speed dating in bridgeport ct.
  6. Methods for Estimating the Due Date.

If you wish to have more people present, please ask our booking staff when you ring to make your appointment. You may be asked to change into a patient gown so that we can easily access your abdomen and asked to lie on our ultrasound bed. A warm gel is applied to you which enables us to send the sound waves through the skin to form the image.

How is a dating scan performed?

Measurements of the pregnancy sac, the fetal pole the first signs of baby , your ovaries and kidneys are documented.