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A dating scan is an ultrasound scan to determine how many weeks pregnant you are and your due date. 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. 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.
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When to have your dating scan
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Safer screening test for pregnant women. Department of Health. Implementation of maternal blood cell-free DNA testing in early screening for aneuploidies.
Ultrasound Obstet Gynecol. Fetal size and dating: charts recommended for clinical obstetric practice.
For most mums-to-be, the first scan will be a dating scan at between 10 weeks and 13 weeks plus six days of pregnancy (NICE ). However, the timing of your first scan will also depend on how your pregnancy is going, and where you live. Your midwife may recommend an early scan at between six weeks and 10 weeks if you have experienced bleeding. A dating scan is an ultrasound examination which is performed in order to establish the gestational age of the pregnancy. Dating scans also reveal other important information such as: the number of fetuses and gestation sacs. the presence of a heart beat. the size of the fetus, from which the gestational age is estimated. What to expect from your week pregnancy scan There are two routine scans in pregnancy and the first is called the week scan or "dating" scan - this is because one of the things it looks at is the exact gestation, giving a better idea of your baby's estimated due date.
Ultrasound ; 17 3 : Non-invasive prenatal testing. Addition of non-invasive test to improve screening for pregnant women. Blog, PHE screening.
Public Health England. Ultrasound scans. Evaluation of gestation emedicine. Pregnancy - screening tests. Health Information.
The pregnancy dating scan. Ultrasound scans in pregnancy.
What is the purpose of the dating scan?
Your guide to screening tests during pregnancy. Antenatal care for uncomplicated pregnancies. ated January National Institute for Health and Care Excellence.
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. As long as the timings are right, you can have the NT scan and blood test at the same appointment as your dating scan. But you'll have the dating scan first. That's because the screening test needs an accurate due date to be reliable (NICE , PHE , NHS b, UK NSC ). Hormones in your blood vary according to your stage of pregnancy. You may need to have a full bladder for this scan, as this makes the ultrasound image clearer. You can ask your midwife or doctor before the scan if this is the case. The dating scan usually takes about 20 minutes. Find out more about what happens during a pregnancy ultrasound scan. Nic Cleave / Alamy Stock Photo.
Multiple pregnancy: antenatal care for twin and triplet pregnancies CG Ectopic pregnancy and miscarriage: diagnosis and initial management CG Ultrasounds performed after 22 weeks gestation cannot be used to estimate the due date of the baby because the size no longer reflects the age very well.
Even average babies can differ by up to 2 to 3 "weeks of growth".
These scans are only used to estimate the due date of your baby if this is all you have to go on. If you have more than one ultrasound during your pregnancy, giving you 'multiple dates', then the earliest ultrasound estimate should be used, because it will be more accurate.
If you have any questions about this, please feel free to talk to your sonographer or doctor about it. Make An Appointment.
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