Early dating scans

All women will be offered a dating scan and an 18–20 week mid-pregnancy or fetal anomaly ultrasound scan.

The main purpose of a dating scan is to check the stage of pregnancy and therefore when the baby is due. Measuring the baby can be more accurate than dating by the last menstrual period.

It is also an opportunity to check the baby is alive and developing as expected, and to check for multiples (twins, triplets, etc.). This scan may also be part of your screening test for Down’s syndrome (nuchal translucency scan).

Occasionally, if the baby is in an awkward position, an internal scan may be carried out, using a vaginal probe. We spoke to a few women who had experienced this. They were not distressed by it, though for some people it may be embarrassing.

The 12-week scan helped check for twins and was a moving experience. The sonographer explained…

Age at interview 33

Gender Female

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As with other scans, most women and their partners if any found it enjoyable and reassuring. They were relieved to see there really was a baby. The chance to take home a photograph was valued; a charge may be made for this.

Many people felt positive about the way staff talked them through what they were doing, including a woman who had seen scans before as a health professional. One woman described how special it seemed to her, whilst for the staff it seemed very routine. They did not say much and it seemed very quick.

The 12-week scan was a wonderful experience for them, but the staff seemed to treat it as very…

Age at interview 32

Gender Female

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Sometimes the 12-week scan is performed at the same time as the booking-in visit with the midwife, so there has been little time to discuss beforehand what might happen. For some people, the dating scan was the point when they discovered that their baby had not survived. Several people described what a terrible shock this was, and how they did not feel prepared for this possibility.

Finding at her first 12-week scan that the baby had died was a terrible shock. Her husband was…

Age at interview 35

Gender Female

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She knew at once something was wrong at her first 12-week scan, when it was discovered the baby…

Age at interview 43

Gender Female

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Because they were not expecting any problems two of these women did not have their partners with them, although both had taken a friend or relative instead and were glad not to be alone. One of them explained how she knew straight away from the behaviour of the person doing the scan (the sonographer) that something was wrong, even though she was supportive and tried not to make her anxious. She was given a photo to keep. Another mother who had paid for a private scan was touched that the staff returned her money when the baby was found to have died.

A dating scan cannot usually provide an assessment of the risk of the baby having Down’s syndrome, but occasionally it can detect very obvious problems. This is something people did not feel well prepared for. One woman’s dating scan was repeated twice that day, and she was eventually told that her baby’s nuchal translucency looked very high, meaning that the baby had more fluid than expected at the back of the neck.

She had no idea the 12-week dating scan could detect problems, and felt completely unprepared for…

Age at interview 35

Gender Female

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Her 12-week dating scan had to be repeated twice, and she was told the baby’s nuchal translucency was high

Age at interview 35

Gender Female

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It later turned out her baby had a serious chromosomal condition (Edward’s syndrome), and the couple decided to end the pregnancy. A mother who did not discover until 20 weeks that her baby’s brain was not formed (anencephaly) had since heard that the condition can sometimes be picked up at the dating scan, although it was not in her case. She would have preferred an earlier diagnosis.

Her views about screening have changed. She has heard that the baby’s anencephaly in her first…

Age at interview 23

Gender Female

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For people who have discovered at a 12-week scan that something was wrong, scans in future pregnancies can be nerve-racking, but they are also relieved and reassured if they can see the baby is alive and well.

A mother who had four miscarriages before her son was born with heart problems commented on how difficult it must be for staff to give bad news, but also described a really positive experience in an early heart scan at 14 weeks in her current pregnancy.

Her history of miscarriage means scans are essential but always worrying. Giving bad news must be…

Age at interview 37

Gender Female

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In an early heart scan in her current pregnancy the sonographer was friendly and welcoming, and…

Age at interview 37

Gender Female

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Occasionally, however, communication seems to lack empathy, as described by a woman who had ended her first pregnancy because her baby had anencephaly and who had a bad experience with the 12-week scan in her next pregnancy.

Communication became difficult and hostile during the 12-week scan in her second pregnancy. They…

Age at interview 23

Gender Female

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Many experiences discussed here are common to other types of scan: see also Nuchal scans and 18–20 week scans.

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