How accurate are ultrasounds at dating pregnancy

In terms of dating, the ultrasound's accuracy depends on the trimester, explains Kara Manglani, CNM, a nurse-midwife practicing in New York City and blogging at The Fertile Times.

She tells Romper that a first-trimester ultrasound can date a pregnancy within three to five days.

Ultrasounds are a staple of modern obstretrics practice, and if you're pregnant, you're probably going to have a number of them.The screening test for Down's syndrome used at this stage of pregnancy is called the "combined test".It involves a blood test and measuring the fluid at the back of the baby's neck (nuchal translucency) with an ultrasound scan.If you have agreed to have screening for Down's syndrome, the dating scan and the screening will usually happen at the same time.Find out more about the combined screening test for Down's syndrome.

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