How accurate are dating scans at 13 weeks

Your sonographer will be able to answer any questions you have on the day and will talk you through the process.

If screening tests show a lower risk, most parents choose not to put themselves, or their unborn baby through further, more invasive tests.

• Check your baby’s general development including their heartbeat, limbs and some organs • Other potential abnormalities including spinal bifida • Most hospitals will be able to sell you a copy of your scan photo for a few pounds or ask for a donation Most units will offer you a screening test at the same time.

Screening tests for Down’s Syndrome is best performed after the dating scan as an accurate due date is required to assess whether hormone levels are actually abnormal or normal for that stage of pregnancy.

This can be due to a number of factors, including whether the pregnancy was planned or not, and if the mother often has irregular periods.

When you are offered a dating scan and the sonographer gains a picture of the baby’s development, they can use this to accurately calculate the baby’s age based on their size and formation.

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This will be a lot more accurate than working it out just using the date of your last period.

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