Obstetric dating ultrasound

21-Mar-2017 06:28

ACR, Diagnostic Radiology: Ultrasonography Practice Parameters and Technical Standards, 2013. A limited examination is performed when a specific question requires investigation. For example, a limited examination in the second trimester or the third trimester could be performed to confirm fetal heart activity in a patient experiencing vaginal bleeding or confirm placental loca- tion or to establish fetal presentation in a laboring patient.

A limited examination also may be performed in any trimester to estimate amniotic fluid volume, evaluate the cervix, or assess embryonic or fetal viability.

ACR-ACOG-AIUM-SRU Practice parameter for the performance of obstetrical ultrasound. An ultrasound examination may be performed either transabdominally or transvaginally.

ACR, Diagnostic Radiology: Ultrasonography Practice Parameters and Technical Standards, 2013. If a transabdominal examination is inconclusive, a transvaginal scan or transperineal scan is recommended.

The American College of Obstetricians and Gynecologists, the American College of Radiology, the American Institute of Ultrasound in Medicine, the National Institute of Child Health and Human Development, the Society for Maternal–Fetal Medicine, and the Society of Radiologists in Ultrasound have adopted the following uniform terminology for the performance of ultrasonography in the second trimester and the third trimester: standard, limited, and specialized ( A standard obstetric ultrasound examination includes an evaluation of fetal presentation and number, amniotic fluid volume, cardiac activity, placental position, fetal biometry, and an anatomic survey.

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The gestational sac should be evaluated for the presence or absence of a yolk sac or embryo, and the crown–rump length of the embryo should be documented.The components of the specialized examination are more extensive than for a standard ultrasound examination and are determined on a case-by-case basis.Also referred to as a “detailed,” “targeted,” or “76811” ultrasound examination, the specialized anatomic examination is performed when there is an increased risk of an anomaly based on the history, laboratory abnormalities, or the results of the limited examination or the standard examination ().The following factors should be considered during the examination.The uterus, including the cervix, and the adnexa should be evaluated for the presence of a gestational sac and any adnexal pathology.

The gestational sac should be evaluated for the presence or absence of a yolk sac or embryo, and the crown–rump length of the embryo should be documented.

The components of the specialized examination are more extensive than for a standard ultrasound examination and are determined on a case-by-case basis.

Also referred to as a “detailed,” “targeted,” or “76811” ultrasound examination, the specialized anatomic examination is performed when there is an increased risk of an anomaly based on the history, laboratory abnormalities, or the results of the limited examination or the standard examination ().

The following factors should be considered during the examination.

The uterus, including the cervix, and the adnexa should be evaluated for the presence of a gestational sac and any adnexal pathology.

During early pregnancy, an abdominal transducer with a frequency of 5 MHz or a transvaginal transducer with a frequency of 5–10 MHz or higher generally provides very good resolution while allowing adequate penetration.