Pregnancy dating scan accuracy what are the best dating services

Advanced Ultrasound – This exam is similar to the standard ultrasound, but the exam targets a suspected problem and uses more sophisticated equipment.Doppler Ultrasound – This imaging procedure measures slight changes in the frequency of the ultrasound waves as they bounce off moving objects, such as blood cells.Before the advent of routine ultrasound in pregnancy, medical personnel estimated a baby's due date by the date of the last menstrual period and by feeling the uterus and determining the size to see if it matched the given due date.With transvaginal ultrasound, checking for embryonic development known to occur within a certain time frame more accurately dates a pregnancy.Please do not go to the toilet for the half hour before your appointment.For a dating scan or placental check, please drink 2 glasses of non-fizzy water one hour before. I popped in this morning for my 12 week scan and I was blown away by how you are genuinely enthusiastic and passionate about what you do.Pregnancy is dated from the first day of the last menstrual period, so at four weeks, a woman is just due for a menstrual period.

Normally, ultrasounds before until week 4 of pregnancy shows nothing in the uterus and serve no purpose.

Just wanting to know if any others have had an EDD from a scan that was different to the EDD calculated based on their LMP (last menstrual period).

Which was correct in the end – the LMP due date or the estimated date of the scan?

At this time, the fetus is a little larger and easier to measure.

Even dating scans can be inaccurate for the due date, but they are never as inaccurate as using the menstrual period.

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