Are dating scans in pregnancy accurate irish dating agencies on line
For all Obstetrics scans, no special preparation is needed, although it is best to wear loose clothing that can easily be lifted or removed in order to expose your abdomen.
You will lie on your back on an examination couch and the transducer moved back and forth across your stomach in order to gain the best possible image of the fetus.
The dating scan is generally the first ultrasound that every mother-to-be will have.
While many women will have a good idea of when they had their last menstrual period, another portion will be far less certain.
However if you develop any symptoms you will need an urgent scan irrespective of number of weeks of pregnancy.
What can be seen on the scan at various stages of early pregnancy?
In these situations a repeat scan one to two weeks later may be necessary to confirm a viable pregnancy and provide accurate dating.
Your doctor will also usually correlate the results with blood tests (serum BHCG) By 6-7 weeks the fetus is usually seen clearly (often requires transvaginal scanning) and its heart beat can be visualised.
This scan may also be performed also if you have an early pregnancy and have bleeding or pain (even if you have already had a scan or are sure of your last menstrual period) to assess if the pregnancy progressing normally. A scan performed between 7-11 weeks pregnancy/gestation is accurate to within 3 days. • The number of babies • The presence of the baby’s heart beat • The position of the pregnancy (check it is in the uterus and not outside, known as an ectopic pregnancy) • The appearance of the uterus and ovaries How is it done?
Ultrasound imaging in pregnancy is widely used to evaluate the baby.
It can determine if a baby is present, the position of the fetus and if there is a multiple pregnancy.
It can also help to diagnose abnormalities or problems, help determine the age of the pregnancy and subsequent due date as well as showing the position of the placenta in relation to the birth canal.
The Royal College of Obstetricians & Gynaecologists (in their 2000 document on Ultrasound Screening), recommend an Early Pregnancy Scan, undertaken before 15 weeks, which can combine the functions of the Early Viability Scan, Nuchal Translucency Scan and dating scan. These two scans are the ‘minimum’ number of scans required during pregnancy and are offered by ¾ of ultrasound units in the UK.