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Dating ultrasound measurements

Although the terms ultrasound and sonogram are technically different, they are used interchangeably and reference the same exam.There are basically seven different ultrasound exams, but the basic process is the same.5 ½ weeks gestation means 5 ½ weeks from the first day of the last menstrual period, which is usually about 3 ½ weeks from the date of conception (confusing, isn’t it!) the fetus is clearly seen on trans-vaginal ultrasound and the heart beat can be seen at this early stage (90 to 110 beats per minute under 6 to 7 weeks, then 110 to 200 beats per minute as the baby matures).

Advanced Ultrasound – This exam is similar to the standard ultrasound, but the exam targets a suspected problem and uses more sophisticated equipment.If you have any questions about this, please feel free to talk to your sonographer or doctor about it.An ultrasound exam is a procedure that uses high-frequency sound waves to scan a woman’s abdomen and pelvic cavity, creating a picture (sonogram) of the baby and placenta.However, the accuracy of the ultrasound examination is always dependent on the skill of the sonographer and the quality of the equipment.Usually the expected date of delivery (EDD or EDC) is calculated from your last menstrual period - if the early dating scan calculates the EDD to be within 5 days of the EDD from your last menstrual period.This is because the fetus is growing so quickly that there is a big difference in size from week to week.Also the fetus cannot bend and twist too much yet, so the length of the body is fairly constant.The EDD from the early dating scan is used - if the last menstrual period is not known or is unreliable, or the dating scan differs from the last menstrual period dating by more than 5 days.As the baby gets bigger, it starts to express its individual growth potential.These scans are only used to estimate the due date of your baby if this is all you have to go on.If you have more than one ultrasound during your pregnancy, giving you 'multiple dates', then the earliest ultrasound estimate should be used, because it will be more accurate.

90 comments

  1. St trimester ultrasound how. Once a fetal Pole can be visualised the CRL measurement is the most accurate method for dating. including measurements. Graphs.

  2. Dating and viability What is a dating scan? A dating scan is an ultrasound examination which is performed in order to establish the gestational age of the pregnancy.

  3. Why Get An Ultrasound? Fetal ultrasound measurements can show how the baby is growing and detect. AC measurements should not be used for dating a fetus.

  4. WHY WOULD I NEED A FIRST TRIMESTER/DATING ULTRASOUND? Not all women need to have an ultrasound in this early part of the pregnancy.

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