Ultrasound for dating pregnancy
The ultrasound technician will put some warm gel on your tummy and move a small hand-held device (transducer) over your skin to get views of your baby. It won't hurt, although you may feel a little pressure on your tummy and from your full bladder. So a blood test at what you thought was 13 weeks wouldn't be helpful if you were actually 16 weeks pregnant. Journal of Obstetrics and Gynaecology Canada 36, 2: 171 – 181. Journal of Obstetrics and Gynaecology Canada 39 (8): e144 - e149. Journal of Obstetrics and Gynaecology Canada 39 (9): e380 - e394. It may lead to you being given a high chance for Down syndrome, when your baby is actually developing normally Audibert F, De Bie I, Johnson J et al. No 348-Joint SOGC-CCMG Guideline: Update on Prenatal Screening for Fetal Aneuploidy, Fetal Anomalies, and Adverse Pregnancy Outcomes. Journal of Obstetrics and Gynaecology Canada 1;39(9): 805 – 817. Journal of Obstetrics and Gynaecology Canada 38 (10): 982 – 988. Pregnancy weeks are counted from the first day of your last menstrual period (LMP). But that won't tell you when you actually conceived.
You can ask your midwife or doctor before the scan if this is the case. Find out more about what happens during a pregnancy ultrasound scan.If you have agreed to have screening for Down's syndrome, the dating scan and the screening will usually happen at the same time.Find out more about the combined screening test for Down's syndrome.However, some major problems can be seen at your dating scan, such as issues with the umbilical cord or with your baby's skull or abdominal wall. Fetal size and dating: charts recommended for clinical obstetric practice. In that case, you might need further tests, or a second scan to check the first scan's findings.