Pregnancy dating acog Journal Logo

Pregnancy dating acog

American College of Obstetricians and Gynecologists.

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Doppler assessment of the fetus with intrauterine growth restriction. Beginning at 14 weeks, a variety of ultrasound parameters, such as biparietal diameter, abdominal circumference, and femoral diaphysis length, can be used to estimate gestational age. Please try after some time.

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Absent or reversed end-diastolic flow in the umbilical artery is associated with an increased risk of perinatal mortality 70— An abnormal test result requires further evaluation, which may include more frequent testing or delivery The gestational age should not be revised after a date has been calculated from an accurate earlier scan that is available for comparison.

However, when a growth disturbance is suspected clinically or there is a medical or obstetric condition that increases the risk of a growth disturbance, ultrasonography is the modality of choice to identify abnormal fetal pregnancy dating acog.

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Quality control should be accomplished through careful documentation of obstetric ultrasound examination results, organized and reliable archiving of reports and images and, ideally, correlation with clinical outcomes. Without these pregnancies dating acog, an intrauterine fluid collection could represent a pseudogestational sac associated with an ectopic pregnancy. Ultrasound in prenatal diagnosis: Significant discrepancies between gestational age and fetal measurements, especially later in pregnancy, may suggest a fetal growth abnormality such as intrauterine growth restriction or macrosomia.

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You may be trying to access this site from a secured browser on the server. This approach is not reliable in women at low risk.

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The search was restricted to articles published in the English language. Noninvasive diagnosis by Doppler ultrasonography of fetal anemia due to maternal red-cell alloimmunization. An embryo should be visible by transvaginal ultrasonography with a mean gestational sac diameter of 25 mm or greater.


The mid-trimester genetic sonogram. Femoral diaphysis length can be used for dating after 14 weeks of gestation. Meta-analysis of second-trimester markers for trisomy Diagnosis and treatment of fetal cardiac disease: Data from the American College of Radiology. For monochorionic twins, who carry a risk of twin—twin transfusion beginning in the second trimester, serial ultrasound evaluation approximately every 2 weeks beginning at around 16 weeks of gestation should be considered 6.

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If a gestational sac is seen, its location should be documented. Studies indicate that the highest detection rate for aneuploidy is achieved with the use of a systematic pregnancy dating acog of markers and gross anomalies, such as thickened nuchal fold, absent or hypoplastic nasal bone, or cardiac defects 50, The best gestational age for obstetric ultrasonography will depend on the clinical indication for the examination.

Second-trimester ultrasound to detect fetuses with Down syndrome: In general, gestational age established by ultrasound examination should take preference over estimates based on the last menstrual period when the discrepancy between the estimated ages is greater than the precision of ultrasonography as noted in Table 1 7.

American Institute of Ultrasound in Medicine. The following factors should be considered during the examination. Although there is no reliable evidence of physical harm to human fetuses from diagnostic ultrasound imaging using current technology, casual use of ultrasonography, especially during pregnancy, should be avoided. For patients with uncertain or unreliable menstrual dating or with an indication to confirm viability, first-trimester ultrasonography is most accurate 7.

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Obstet Gynecol Surv ; The necessary components of fetal anatomy in a standard pregnancy dating acog 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.

The defined volume then can be displayed in three orthogonal two-dimensional planes representing the sagittal, transverse, and coronal planes of a reference two-dimensional image within the volume.

Sonographic estimation of fetal weight: