How is a dating scan performed?

Read on for more information about what a dating scan offers. A dating scan might be recommended to confirm your due date if you are unsure of your last menstrual period or your date of conception. It is usually offered to pregnant women from 10 weeks to 13 weeks gestation, but can be carried out any time from 6 weeks.

Your 12-week pregnancy dating scan

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.

What to expect on the day?

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.

12 week pregnancy dating scan: What do I need to know?

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.

6 week and 1 day dating scan

In the second trimester of pregnancy, you may be offered to have an morphology scan anomaly scan. Learn about what it looks for and when it is performed. A nuchal translucency scan is part of the ultrasound scan that may give an indication of chromosomal abnormality.

Will the dating scan happen at exactly 12 weeks?

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. 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.

week pregnancy dating scan - NHS

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 sonographer will then use a transducer device which uses ultrasound to produce an image of your baby inside the womb to a small display screen next to you. The scan will usually last for around 20 minutes.

This will be a lot more accurate than working it out just using the date of your last period. Most units will offer you a screening test at the same time.

Your pregnancy and baby guide

If screening tests show a lower risk, most parents choose not to put themselves, or their unborn baby through further, more invasive tests. What do I need to know? Non-Invasive Prenatal Testing Nuchal Translucency Scan Pregnancy ultrasound scans Rhesus disease and Anti-D injections Testing and screening for chromosome abnormalities X-rays can affect your pregnancy What is a third trimester pregnancy growth scan? What you need to know about a cervical length pregnancy scan 12 week pregnancy dating scan: Deciphering maternity note abbreviations.