An ultrasound—also known as a sonogram—uses sound waves to produce a picture of your baby in the womb.These pictures show up on a computer screen at your bedside during the test.It is important for women having an ultrasound to be aware of this small, but real risk of false positives.
You may be wondering this about your due date, your baby's gender or more serious things like a miscarriage diagnosis.
First, let's quickly go over the basics of ultrasound.
That's why doctors often need two consecutive scans to diagnose miscarriage.
But sometimes it is possible to confirm a miscarriage based on a single ultrasound.
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 #Stencil .
Bdend-1g /* Trending Now */ /* Center Rail */ #ya-center-rail .profile-banner-default .ya-ba-title #Stencil . Bgc-lgr #ya-best-answer, #ya-qpage-msg, #ya-question-detail, li.ya-other-answer .tupwrap .comment-text /* Right Rail */ #Stencil . Bxsh-003-prpl #yai-q-answer, #ya-trending, #ya-related-questions h2. Fw-300 .qstn-title #ya-trending-questions-show-more, #ya-related-questions-show-more #ya-trending-questions-more, #ya-related-questions-more /* DMROS */ .But ultrasounds are not 100 percent reliable for everything they measure.The accuracy of an ultrasound test can vary based on factors such as the stage of the pregnancy, the quality of the machine, the skill of the practitioner, and the position of the baby in your womb.In fact, it's thought that only around four percent of women give birth naturally on their due date.If you still have questions, learn more about the accuracy of ultrasound in predicting your due date.It's thought that a second trimester ultrasound, often done between 16 an 20 weeks, may detect three out of four major birth defects.