Most accurate dating pregnancy ultrasound
The dating scan will also show if you're expecting twins, triplets, or more.
Most hospitals or ultrasound clinics ask you to arrive with a 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.
Embryonic CRL measurement is more accurate than using Last menstrual period dates or physical exam in dating a pregnancy, remember if you suffer from Irregular periods due to PCOS or any other conditions then more likely Ultrasounds measurement are going to be different from your gestational age.
So if you have the first scan and NO visible intrauterine pregnancy was seen but you have a Positive pregnancy urine test, the doctor will probably do a blood work to check levels of HCG in blood, in case you didn’t read my previous post I will link it below: All you need to know about early gestation.During your dating scan your baby is carefully measured. These measurements tell your healthcare provider how far along in your pregnancy you are. Journal of Obstetrics and Gynaecology Canada 1;39(9): 805 – 817. Journal of Obstetrics and Gynaecology Canada 38 (10): 982 – 988.