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Obstetric dating and assessment

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gets its carbon straight from the air, complete with a full dose of c-14.

he found that his methods, while not as accurate as he had hoped, were fairly reliable.

By 5-6 weeks gestation the yolk sac is visible, although the embryo is usually not reliably seen until about 6 weeks gestation when it measures approximately 5mm in length.

The embryonic heart beat should be visible at 6 weeks gestation.

General management measures include treatment of maternal disease, good nutrition and institution of bed rest.

Preterm delivery is indicated if the fetus shows evidence of abnormal function on biophysical profile testing.

isochron dating technique was thought to be infallible because it supposedly covered the assumptions about starting conditions and closed systems.

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As soon as data from the last menstrual period, the first accurate ultrasound examination, or both are obtained, the gestational age and the estimated due date (EDD) should be determined, discussed with the patient, and documented clearly in the medical record.Subsequent changes to the EDD should be reserved for rare circumstances, discussed with the patient, and documented clearly in the medical record.A pregnancy without an ultrasound examination that confirms or revises the EDD before 22 0/7 weeks of gestational age should be considered suboptimally dated.A lag in fundal height of 4 cm or more suggests IUGR.Serial ultrasonograms are important for monitoring growth restriction, and management must be individualized.Ultrasound biometry is the gold standard for assessment of fetal size and the amount of amniotic fluid.