Back to Your pregnancy and baby guide. All pregnant women in England are offered an ultrasound scan at around 8 to 14 weeks of pregnancy. This is called the dating scan. It's used to see how far along in your pregnancy you are and check your baby's development. Your midwife or doctor will book you a dating scan appointment. It will usually take place at your local hospital ultrasound department. The person performing the scan is called a sonographer.
Instead, you will be offered another blood test between 14 and 20 weeks of pregnancy to screen for the risk of Down's syndrome. This test is not quite as accurate as the combined test. Skip to main content. Your pregnancy and baby guide.
Baby dating scan
Main navigation Getting pregnant Secrets to success Healthy diet Planning: When you can get pregnant Signs and symptoms When you can take a test Finding out Problems Help if you're not getting pregnant Fertility tests Fertility treatments Work out your due date When pregnancy goes wrong Sign up for weekly pregnancy emails. Early days Your NHS pregnancy journey Signs and symptoms of pregnancy Health things you should know Due date calculator Week by week 4 to 8 weeks 9 to 12 weeks 13 to 16 weeks 17 to 20 weeks 21 to 24 weeks 25 to 28 weeks 29 to 32 weeks 33 to 36 weeks 37 to 40 weeks 40 weeks plus Pregnancy week by week Twins Antenatal care with twins Pregnant with twins Healthy multiple pregnancy Getting ready for twins Preparing for the birth Where to give birth: Your health and wellbeing Healthy eating Foods to avoid Drinking alcohol while pregnant Exercise Vitamins and supplements Stop smoking Your baby's movements Sex in pregnancy Pharmacy and prescription medicines Reduce your risk of stillbirth Illegal drugs in pregnancy Your health at work Pregnancy infections Travel If you're a teenager Existing health problems Overweight and pregnant Mental health problems Diabetes in pregnancy Asthma and pregnancy Epilepsy and pregnancy Coronary heart disease and pregnancy Congenital heart disease and pregnancy Common pregnancy ailments Backache Bleeding gums Headaches Heartburn Itching Morning sickness Severe vomiting Pelvic pain Piles Stretch marks Stomach pain or cramps Swollen ankles Tiredness and sleep Vaginal bleeding Vaginal discharge More common problems Pregnancy-induced conditions Hyperemesis gravidarum Real story: The start of labour Signs of labour What happens when you arrive at hospital Premature labour Induction The birth What happens during labour and birth Forceps and ventouse delivery Pain relief Episiotomy What your birth partner can do Breech and transverse birth Caesarean Giving birth to twins What happens straight after the baby is born You after the birth Getting to know your newborn Emotions and worries Feelings and relationships Dads and partners If you have a chronic condition When pregnancy goes wrong Premature babies Premature or ill babies Premature baby: How to breastfeed Breastfeeding: The average weight is less than 1 gram.
Obviously, every pregnancy is unique and individual factors influence the size of the embryo at this early stage, and the embryo shows development week by week.
The ideal time for a sonographer to assess the gestational age in the first trimester is between weeks of pregnancy. This is the period of time which provides the most accurate assessment. Generally, ultrasounds which are performed in the first trimester are within days of being accurate in terms of assessing gestational age.
This is because although every little embryo is unique, there are still defining characteristics of development which apply to all embryos at particular stages of early gestational development. As the embryo matures to a foetus, individual genetics and growth factors influence its growth. This is why an early pregnancy dating scan, rather than one done in the later stages of pregnancy, is considered more accurate when assessing the expected date of delivery.OUR 12 WEEK SCAN!
With maturity, the size of the baby correlates less to its age than in the early weeks. There are two ways of having a seven week ultrasound. One is via the abdomen — transabdominally and the other is through the vagina — transvaginally.
Some sonographers believe that at seven weeks of gestation, transvaginal ultrasound provides the best and most accurate visualisation. With this form of scan it is not as necessary for the mother to have a full bladder.
Later on as the pregnancy progresses, a full bladder is not necessary as the enlarging uterus is no longer contained in the pelvic rim. In very early pregnancy, the embryo and pregnancy sac may simply be too small to see very much at all. But with every day which passes, the embryo becomes bigger and more advanced in its development. Learn more about how and when it is performed.
During your pregnancy, you will be offered a number of tests and scans.
7 Week Ultrasound
The aim is always to check on the health of you and your baby, but it can sometimes be overwhelming and confusing. Ultrasound scans in pregnancy are a way ofchecking onthe developing baby. Ultrasound scansusehigh-frequency soundwaves to create moving images of the baby, shown on a screen.
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.
If you have a particular medical problem, please consult a healthcare professional. Access trusted, quality health information and advice Visit healthdirect.
Access quality information from pregnancy planning through to early parenthood Visit Pregnancy, Birth and Baby. Access information to help you navigate the aged care system Visit My Aged Care. A great place to start for support and services Visit Carer Gateway. General health Pregnancy and parenting Aged care Caring for someone.
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?