does radiometric age dating work - Accuracy sonogram dating

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This vibration effect, commonly referred to as cavitation, has been cited in some studies as potentially causing harm to developing fetuses.

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have issued position statements discouraging the nonmedical use of ultrasound for the purposes of gender identification or keepsake videos and pictures.

This position is supported by the US Food and Drug Administration, which considers the nonmedical use of ultrasound to be an unapproved use of a medical device.

When one also considers the costs of postterm surveillance, which typically includes twice weekly nonstress tests and weekly amniotic fluid measurements, there are potential cost savings with accurate dating by early ultrasound assessment -- not to mention the costs of fetal fibronectin cultures or the clinical and legal implications of inappropriately managing preterm labor.

Does it not then behoove all obstetric providers to discuss and offer routine ultrasound screening to every pregnant woman, even in the absence of medical indications?

One must keep in mind, however, that there are differences in both the statistical analysis and in how the results are reported.

For example, when the margin of error is reported as a percent of the total, it is calculated against the number of days gestation verses the number of weeks. Fw-300 #ya-qn-sort h2 /* Breadcrumb */ #ya-question-breadcrumb #ya-question-breadcrumb i #ya-question-breadcrumb a #bc .ya-q-full-text, .ya-q-text #ya-question-detail h1 html[lang="zh-Hant-TW"] .ya-q-full-text, html[lang="zh-Hant-TW"] .ya-q-text, html[lang="zh-Hant-HK"] .ya-q-full-text, html[lang="zh-Hant-HK"] .ya-q-text html[lang="zh-Hant-TW"] #ya-question-detail h1, html[lang="zh-Hant-HK"] #ya-question-detail h1 /* Trending Now */ /* Center Rail */ #ya-center-rail .profile-banner-default .ya-ba-title #Stencil . Bgc-lgr .tupwrap .comment-text /* Right Rail */ #Stencil . Fw-300 .qstn-title #ya-trending-questions-show-more, #ya-related-questions-show-more #ya-trending-questions-more, #ya-related-questions-more /* DMROS */ .Cost-benefit ratios of routine ultrasound use have still not been completely resolved in every practice setting, with one study suggesting that community-based hospitals would actually lose money if routine ultrasound screening is performed.further states that ultrasound sensitivity in detecting fetal anomalies remains controversial, with higher detection rates reported at tertiary centers and higher sensitivity rates overall for central nervous system and urinary tract versus cardiac anomalies.In midwifery practices especially, where the focus on nonintervention predominates, a single ultrasound performed before 24 weeks' gestation will not only reliably confirm the EDD but, as many of the previously cited studies suggest, may in fact reduce the likelihood of unnecessary interventions.

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