Obstetric dating scan viability

A dating scan is an ultrasound scan to determine how many weeks pregnant of Health (Guidelines for the use of ultrasound in the management of obstetric.
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Learn more about how and when it is performed.

During your pregnancy, you will be offered a number of tests and scans. The aim is always to check on the health of you and your baby, but it can sometimes be overwhelming and confusing.


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Handy infographic that shows what you can expect at each antenatal appointment during your pregnancy. In the meantime, we will continue to update and add content to Pregnancy, Birth and Baby to meet your information needs. This information is for your general information and use only and is not intended to be used as medical advice and should not be used to diagnose, treat, cure or prevent any medical condition, nor should it be used for therapeutic purposes. The information is not a substitute for independent professional advice and should not be used as an alternative to professional health care.

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Methods for Estimating the Due Date

Dating scans are used to confirm how many weeks pregnant you are and your expected due date. Why would I have a dating scan?

How is a dating scan performed? What preparation do I need to do for a dating scan? Check with your ultrasound clinic for any preparation you need to do prior to the scan. The scan will take 5—10 minutes to perform.

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What will I learn from a dating scan? At a dating scan you will also be able to: Australian Government Department of Health Guidelines for the use of ultrasound in the management of obstetric conditions. Opens in a new window. BabyCenter Australia Dating scans. BabyCenter Australia Pregnancy ultrasound scans: Was this article helpful?

Find out about early ultrasounds at weeks, sometimes called dating scans. Pregnancy tests information video myVMC. A Fetal Viability Scan is an ultrasound examination, usually carried out at 7 to 12 weeks , to confirm that the pregnancy is developing normally and to provide reassurance. Additionally, this scan will confirm or exclude whether twins are present.

Obstetric (Pregnancy) | BMUS

It is generally advisable to not have an ultrasound examination prior to 7 weeks as frequently the pregnancy sac may be too small to be visible on ultrasound at such an early gestational age. Fetal Viability Scans are performed either by the trans-abdominal or trans-vaginal route.

What is the purpose of the dating scan?

For a trans-abdominal scan early in pregnancy it is important to ensure that the bladder is full prior to the appointment. If adequate views of the pregnancy cannot be obtained, then a trans-vaginal scan will usually be performed to get a more detailed view of the inside of the uterus. This is a simple procedure, in which a thin ultrasound probe with a sterile cover is gently inserted into the vagina to provide detailed pictures of the inside of the uterus.