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A pregnancy can be seen from as early as 6 weeks from the first day of your last period (LMP) and not the date of conception.
If you have had any bleeding or pain or any other symptoms then this scan will accurately confirm viability.
Sometimes it is requested by a doctor or midwife to confirm that your pregnancy is healthy (in this case your scan is often called a viability scan) and to calculate the date when your baby is due (usually referred to as a dating scan).Screening for Down's syndrome will happen at the dating scan if: The screening test for Down's syndrome used at this stage of pregnancy is called the combined test.The combined test involves a blood test and measuring the fluid at the back of the baby's neck (nuchal translucency) with an ultrasound scan.It will usually take place at your local hospital ultrasound department.The person performing the scan is called a sonographer.
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Crown/rump length and gestational age are closely compared with each other until around the end of the first trimester.