If you have had bleeding during your pregnancy or you have had previous miscarriages , your doctor or midwife may recommend an early dating scan from 6 to 10 weeks gestation. If you choose to have a dating scan, it will most probably be your first scan. You will need to get a referral from your doctor or midwife for a dating scan.
A dating scan is carried out by ultrasound. A sonographer, who is usually a radiographer or a midwife trained in ultrasound, will complete your scan. If the scan is after 10 weeks, ultrasound recordings are usually made through your abdomen. The sonographer will put gel on your abdomen and move a hand-held device called a transducer, back and forward over your skin. In some situations, such as when the scan is completed before 10 weeks of gestation or you are overweight, you may also need a vaginal scan.
Your sonographer will let you know if this is needed. For an abdominal dating ultrasound, you will need to have a full bladder. You may be asked to drink some water and not go to the toilet beforehand because a full bladder helps to push your womb up to give a better picture. For a vaginal scan, you can have an empty bladder. This will provide a fairly accurate estimate of how many weeks pregnant you are.
But it is important to remember that only a few women go into labour on their due date, so it can be more helpful to think about the month in which you are expecting your baby, rather than the exact day. Information on pregnancy ultrasound scans including when they are taken, what it can be used for, dating scans, anomaly scans, plus links to trusted resources. This Dads Guide to Pregnancy article covers early pregnancy scans and screening, plus normal fetal development and early miscarriage for men, by men.
In the second trimester of pregnancy, you may be offered to have an morphology scan anomaly scan.
- Routine ultrasound – Pregnancy Info.
- When is a dating scan necessary?;
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Learn about what it looks for and when it is performed. An ultrasound in the first trimester can give an accurate estimated date of confinement EDC to within days.
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Confirming the location of your pregnancy. Your doctor may have concerns that your pregnancy is located in the fallopian tube ectopic pregnancy. This ultrasound will check if your pregnancy is developing normally within the uterus. Determining the number of babies present.
What is the purpose of the dating scan?
Your doctor may be concerned about you having more than one baby for example, twins or triplets if your pregnancy was conceived with the help of clomiphene or IVF, you have a family history of twins, you have severe morning sickness or your uterus seems larger than expected. This ultrasound can determine the number of babies, as well as the type of twins.
Identifying pregnancies at increased risk of miscarriage or pregnancy loss. Checking other pelvic organs.
Women's Health Care Physicians
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 ovaries for example, if you have pelvic pain and there is concern about an ovarian cyst. Your doctor may be concerned about your pregnancy because of abdominal pain or vaginal bleeding.
This early ultrasound can provide reassurance that everything is progressing normally. It may also detect a serious problem with either you or your pregnancy, some of which require further investigations or treatment. Your doctor will discuss the reasons for such follow-up, if this is necessary.
Assess the size of your baby. The baby is measured from one end to the other crown-rump-length, or CRL. Assess the location of the pregnancy. The pregnancy normally develops in the uterus, within the endometrium the lining of the uterus.
Sometimes a pregnancy may not be developing in the correct place an ectopic pregnancy. The most common location for an ectopic pregnancy is the fallopian tube. Assess the gestation sac. The baby is growing inside a small sac, called the gestation sac. The size and appearance of this sac will be assessed. Assess the number of babies. We will confirm the presence of a heartbeat in your baby and measure the heart rate. The heart rate of babies is much quicker than adults.
Assess the uterus and ovaries. We will review the uterus for such conditions as fibroids, and the ovaries for such conditions as ovarian cysts. Your baby will change dramatically in appearance during this early part of the pregnancy.
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First trimester gestation sac. Nine week old embryo. But by the time the baby has developed to full term, this rate increases to around BPM.
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One of the reasons for this is because the heart needs to work harder and more efficiently to pump oxygenated blood around its much larger body and brain. The quality of the equipment and the skill of the sonographer are very important when doing any pregnancy ultrasound.
First Trimester / Dating Ultrasound | Advanced Women's Imaging
Like every other health professional, individual skill, expertise and training make a big difference to the outcome of their assessments. When you are first referred for a seven week ultrasound, the first of many types of ultrasound , ask your GP or maternity care provider who has the best reputation for quality scan results. You may also like to ask your friends who have had a positive experience and to see who they would recommend in terms of having firsthand experience. When an ultrasound is done between weeks of pregnancy, gestational weeks are considered as being within 10 days of accuracy.
There are many reasons why not. This applies at whatever stage of gestation the ultrasound is done. Join Huggies now to receive week by week pregnancy newsletters. Pregnancy Week by Week Take a look at each week of your pregnancy, from conception to birth, with our comprehensive email newsletters. You'll need to activate to enter promotions - find out more. Didn't get the email? What best describes you? I'm trying to conceive I'm having a baby I'm a parent I'm a carer. Tell us a little bit about your child.