Gestational dating ultrasound

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.3-D Ultrasound – Uses specially designed probes and software to generate 3-D images of the developing fetus.The gel helps improve contact between the probe and your skin. It involves scanning with the ultrasound probe lying in the vagina.Transvaginal ultrasound usually produces better and clearer images of the female pelvic organs including the developing pregnancy, because the ultrasound probe lies closer to these structures.

Most often used during the early stages of pregnancy.Test results are interpreted based on Liley's zones relative to gestational age.Again, inaccurate assessment of gestational age will lead to errors in assessing the severity of fetal sensitization by the delta OD 450.This terminology does vary geographically and over time, and it may need clarification if not explicitly defined in relevant articles.Gestational age, synonymous with menstrual age, is defined in weeks beginning from the first day of the last menstrual period (LMP) prior to conception.

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For related information, see Medscape's Pregnancy Resource Center.

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