Us obstetric dating scan viability

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It may require correlation with an additional follow up scan and or estimation of BHCG level.There are certain criteria to be met before a pregnancy viability/failure is diagnosed.You won't be offered the combined screening test if your dating scan happens after 14 weeks.

It involves a blood test and measuring the fluid at the back of the baby's neck (nuchal translucency) with an ultrasound scan.What can be seen on the scan at various stages of early pregnancy?A pregnancy sac is visible usually at 5 weeks of gestation (calculated from the last menstrual period).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. Find out more about what happens during a pregnancy ultrasound scan.

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