Dating ua 2016

This Practice Bulletin was developed by the American College of Obstetricians and Gynecologists’ Committee on Practice Bulletins–Obstetrics and the American Institute of Ultrasound in Medicine in collaboration with Lynn L. The information is designed to aid practitioners in making decisions about appropriate obstetric and gynecologic care.

These guidelines should not be construed as dictating an exclusive course of treatment or procedure.

Portions of this Practice Bulletin were developed from collaborative documents with the American College of Radiology and the American Institute of Ultrasound in Medicine (1, 2).

Committee on Practice Bulletins—Obstetrics and American Institute of Ultrasound in Medicine.

However, the mean gestational sac diameter may be recorded when an embryo is not identified.

Caution should be used in presumptively diagnosing a gestational sac in the absence of a definite embryo or yolk sac.

Images should be archived and easily accessible for later review.

To ensure that the ultrasound equipment is operating at a safe and optimal level, regular service should be performed as recommended by the manufacturer.Without these findings, an intrauterine fluid collection could represent a pseudogestational sac associated with an ectopic pregnancy.Presence or absence of cardiac activity should be reported.If a gestational sac is seen, its location should be documented.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 necessary components of fetal anatomy in a standard examination are listed in Box 1 and commonly can be obtained after approximately 18 weeks of gestation, although it may be possible to document normal structures before this time.

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