the pregnancy is intrauterine, growing in the womb and not ectopic, i.e. After 14 weeks in pregnancy the baby’s measurements change, we now measure the head circumference (HC), abdominal circumference (AC) and femur length (FL).We change to these measurements as the baby is now ‘curling’ and the CRL measurement becomes inaccurate at determining gestational age to date the pregnancy.For many expecting mums who do not want to go down the route of screening for a chromosomal abnormality such as Down’s syndrome then this scan can be performed to give reassurance that all is well up to 18 weeks of pregnancy.The dating pregnancy scan performed between 6 – 18 weeks will confirm: That a gestation sac is seen within the uterus i.e. By 6/7 weeks in pregnancy it is possible to detect the baby’s heart beat(s) We measure the baby’s head (crown) to bottom (rump) length (CRL) allowing us to determine how many weeks pregnant you are.The dating scan is an ultrasound scan that can be done as early as six weeks after the last period, but the dating scan will be most accurate when done between 8 and 12 weeks gestation.At this time, the fetus is a little larger and easier to measure.The heart can be seen beating in the chest area and the stomach, bladder and cord insertion are visible.
The baby usually measures 10 – 20 mm and a heartbeat can be seen clearly Baby now measures 20 – 30 mm and again a heartbeat is clearly visible.Chances of pregnancy continuing 98% Baby now measures 35 – 40mm and if the heartbeat is present and the baby measures appropriately for your dates, the chances of the pregnancy continuing is 99.4%.The baby is now measuring approximately 45mm and clearly has a distinguishable head, body, arms and legs.Should a problem be found, we will make all the necessary arrangements for follow-up care at a suitable time and location of your preference.Dating a pregnancy accurately at the earliest possible time is important.
This is normally done in the consulting room for a small out of pocket cost.