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Obstetrical (OB) ultrasound studies must be well documented in order to support the CPT® code(s) chosen.The CPT code book lists the required elements for all OB ultrasound codes, and gives instructions to look for all of these elements in the radiology report in order to choose a complete study code.The International Society of Ultrasound in Obstetrics and Gynecology (ISUOG) recommends that pregnant women have routine obstetric ultrasounds between 18 weeks and 22 weeks gestational age in order to confirm pregnancy timing, to measure the fetus so that growth abnormalities can be recognized quickly later in pregnancy, and to assess for congenital malformations and multiple gestations (i.e. Additionally, the ISUOG recommends that pregnant women have obstetric ultrasounds between 11 weeks and 13 weeks 6 days gestational age in countries with resources to perform them.Performing an ultrasound at this early stage of pregnancy can more accurately confirm the timing of the pregnancy and can also assess for multiple fetuses and major congenital abnormalities at an earlier stage.Obstetric ultrasonography is the use of medical ultrasonography in pregnancy, in which sound waves are used to create real-time visual images of the developing embryo or fetus in its mother's uterus (womb).The procedure is a standard part of prenatal care in many countries, as it can provide a variety of information about the health of the mother, the timing and progress of the pregnancy, and the health and development of the embryo or fetus. The bright white circle center-right is the head, which faces to the left.

Human pregnancy lasts an average of 280 days from the first day of the last menstrual period in patients with regular 28-day menstrual cycles.

Using this imaging technique, clinicians can detect pregnancy as early as 3 weeks after conception, confirm or revise gestational age with reasonable accuracy, diagnose multiple gestation in early pregnancy, confidently diagnose fetal death at any gestational age, assess fetal well-being, evaluate amniotic fluid volume, and diagnose a broad variety of fetal malformations.

Advances in sonographic imaging in the past decade are attributable to both improved image resolution and to better clinical interpretation of ultrasound findings.

In normal state, each body tissue type, such as liver, spleen or kidney, has a unique echogenicity.

Fortunately, gestational sac, yolk sac and embryo are surrounded by hyperechoic (brighter) body tissues.

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