Pregnancy dating and viability

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This scan is performed in early pregnancy to determine the age of the pregnancy (also known as the gestational age) using measurements.The measurements are from one end of the fetus to the other, known as the crown-rump length, or CRL. This scan is usually done if you are unsure about the dates of your last menstrual period (LMP) or have irregular periods.This scan may involve optional transvaginal (internal) scanning.Blue Ridge Women’s Center can provide limited obstetrical ultrasound for these purposes—free of charge—if you have a positive pregnancy test at the Center and are 8 weeks pregnant.If a full diagnostic ultrasound would be more appropriate for your situation, because you’re further along in your pregnancy or experiencing medical problems, our staff will be happy to refer you to an OB-GYN who can offer that instead.

This involves an internal probe being gently placed into the vagina with a sterile protective sheath (usually less discomfort than a PAP smear) This allows better images as the probe lies closer to these structures.You may have calculated the length of your pregnancy from the first day of your last menstrual period (LMP).This is even though you don't actually conceive until 14 days after your LMP, or later than this if your cycle is longer than 28 days.If you are less than 6 weeks gestation when you attend the scan we will assess and estimate the dates of your pregnancy.It is not possible to determine gender at this early stage.Your midwife may recommend an early scan at between six weeks and 10 weeks if you have experienced bleeding.

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