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examined the efficacy of routine ultrasound screening in more than 15,000 low-risk pregnant women.

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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 */ .This vibration effect, commonly referred to as cavitation, has been cited in some studies as potentially causing harm to developing fetuses.Practicing what is commonly referred to as the "ALARA" principle (As Low As Reasonably Achievable), there have been no studies to date that have reported any adverse bioeffects on human fetuses as a result of exposure to the low levels of ultrasound energy in use today.

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