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description: Dating > When is dating scan done
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# When is dating scan done

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Here you will find a brief history of technology. A small amount of ultrasound gel is placed on the end of this probe.\
&#x20;![when is dating scan done](http://resources1.news.com.au/images/2010/03/16/1225841/597117-100317-graphic-ct-scans.jpg)\


You'll also have the chance to talk about what any abnormalities could mean for the future health and development of your baby Skirton et al 2014. Ultrasound scans have been used in medico for more than 40 years with no known side-effects. However, it is important to remember that the main purpose of the scan is not to provide the first photo for your baby album. This applies at whatever stage of gestation the ultrasound is done. Most mums-to-be would too say it's a good idea to have some company, especially if you're anxious about the scan. Your doctor may want an ultrasound to check other things in your pelvis apart from your pregnancy, such as the uterus for example, if you have a history of fibroids and the caballeros for example, if you have pelvic pain and there is concern when is dating scan done an ovarian cyst. The results of an ultrasound are immediately seen on a monitor when the procedure is being carried out. You may find at this scan your due date is altered on your notes.

The entire luteum will everywhere friend get smaller as the intention continues. It involves scanning with the ultrasound probe lying in the vagina.\
&#x20;![when is dating scan done](http://slideplayer.com/5670939/18/images/13/1.+What+is+a+dating+scan+and+when+is+it+done.jpg)\


**First Trimester / Dating Ultrasound** - How big will my baby be at the 7 week ultrasound?\
&#x20;![when is dating scan done](http://cdn.mamamia.com.au/wp/wp-content/uploads/2016/04/11165916/0441_15_IV_FirstTrimester-4.png)\


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. Most dating scans are done with a trans-abdominal transducer and a fullish bladder. If the pregnancy is very early the gestation sac and fetus will not be big enough to see, so the transvaginal approach will give better pictures. For transvaginal ultrasound you can have an empty bladder When is it recommended? Dating scans are usually recommended if there is doubt about the validity of the last menstrual period. At 5 ½ weeks gestation a tiny sac can be seen in the uterus, but the baby and its heart beat may not be detected yet. By 6 to 7 weeks gestation 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. By 8 weeks gestation the baby and its heart beat can be detected relatively easily with trans-abdominal and trans-vaginal examination. This is presuming that the pregnancy is actually at this stage of development. Sometimes a trans-vaginal examination shows that your pregnancy is less advanced than expected. How accurate is the ultrasound examination? The earlier the ultrasound is done, the more accurate it is at estimating the baby's due date. Ultrasounds performed during the first 12 weeks of pregnancy are generally within 3 - 5 days of accuracy. The most accurate time is between 8 and 11 weeks gestation. 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. However, the accuracy of the ultrasound examination is always dependent on the skill of the sonographer and the quality of the equipment. The scan or my dates - which should I believe? 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. 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. The size of the baby correlates less and less with its age as time goes on. Ultrasound examinations from 12 to 22 weeks are regarded as being within 10 days of accuracy or up to 10 days earlier or 10 days later than the woman's calculated due date. Ultrasounds performed after 22 weeks gestation cannot be used to estimate the due date of the baby because the size no longer reflects the age very well. 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. If you have any questions about this, please feel free to talk to your sonographer or doctor about it. You can estimate the due date of the baby by using our. What can be seen?
