{"id":8223,"date":"2025-07-07T09:30:00","date_gmt":"2025-07-07T07:30:00","guid":{"rendered":"https:\/\/famicord.lu\/?post_type=pregnancy_zone&#038;p=8223"},"modified":"2025-12-19T12:50:16","modified_gmt":"2025-12-19T11:50:16","slug":"gestational-sac","status":"publish","type":"pregnancy_zone","link":"https:\/\/famicord.lu\/en\/pregnancy-zone-2\/pregnancy-information\/gestational-sac","title":{"rendered":"Gestational sac \u2013 what is its function?"},"content":{"rendered":"\n<p class=\" eplus-wrapper\">The first sign of a correctly located pregnancy is the visualization of the gestational sac in the uterus during an ultrasound examination. However, the mere presence of the gestational sac does not necessarily indicate a normally developing pregnancy. So, what does it mean if the gestational sac is empty?<\/p>\n\n\n\n<h2 class=\" wp-block-heading eplus-wrapper\"><strong>What is the gestational sac?<\/strong><\/h2>\n\n\n\n<p class=\" eplus-wrapper\">The gestational sac (GS) is a small, round, fluid-filled structure and represents the first stage of early pregnancy. Before the embryo and its heartbeat can be detected, the sac helps determine whether the pregnancy is correctly located within the uterus. Following the appearance of the gestational sac, the yolk sac, embryo, and amniotic cavity develop in that order.<\/p>\n\n\n\n<h2 class=\" wp-block-heading eplus-wrapper\"><strong>Gestational sac \u2013 ultrasound<\/strong><\/h2>\n\n\n\n<p class=\" eplus-wrapper\">Most women undergo their first ultrasound after receiving a positive pregnancy test in urine or blood \u2013 usually between the 5th and 7th week of pregnancy. The gestational sac should be visible when the blood beta-hCG level reaches approximately 1500 IU\/ml. The gynecologist will check the position of the gestational sac in the uterus, measure it, and determine how many sacs are present. If the beta-hCG level is high but no gestational sac can be found in the uterus, there is a high risk of an ectopic pregnancy (extrauterine pregnancy).<\/p>\n\n\n\n<h2 class=\" wp-block-heading eplus-wrapper\"><strong>Size of the gestational sac<\/strong><\/h2>\n\n\n\n<p class=\" eplus-wrapper\">The size of the gestational sac on ultrasound can be used to estimate the gestational age \u2013 even before the crown-rump length (CRL) of the embryo can be measured. Guideline values are:<\/p>\n\n\n<ul class=\" wp-block-list eplus-wrapper eplus-styles-uid-b1e10d\">\n<li class=\" eplus-wrapper\">\u202fGestational sac 1\u20134 mm = 4th\/5th week of pregnancy<\/li>\n\n\n\n<li class=\" eplus-wrapper\">Gestational sac 5\u20138 mm = 5th\/6th week of pregnancy<\/li>\n<\/ul>\n\n\n<p class=\" eplus-wrapper\">Normal daily growth of the gestational sac is about 1\u20131.2 mm. If the sac is larger than 20 mm and no embryo is visible, there is a very high risk of miscarriage (known as a blighted ovum or empty sac).<\/p>\n\n\n\n<h2 class=\" wp-block-heading eplus-wrapper\"><strong>Empty gestational sac<\/strong><\/h2>\n\n\n\n<p class=\" eplus-wrapper\">If an empty gestational sac is visible on ultrasound, it means the pregnancy has developed without an embryo. The yolk sac and amniotic cavity may develop normally, but the embryo either never forms or is reabsorbed at a very early stage. An empty gestational sac equals a miscarriage. The most common cause is genetic abnormalities. However, it can also be due to immunological disorders or infections. Important to note: An empty gestational sac does not increase the risk of miscarriage in future pregnancies.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The first sign of a correctly located pregnancy is the visualization of the gestational sac in the uterus during an ultrasound examination. However, the mere presence of the gestational sac does not necessarily indicate a normally developing pregnancy. So, what does it mean if the gestational sac is empty? What is the gestational sac? The [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":8221,"template":"","pregnancy_zone_category":[86],"class_list":["post-8223","pregnancy_zone","type-pregnancy_zone","status-publish","has-post-thumbnail","hentry","pregnancy_zone_category-pregnancy-information"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Gestational Sac in Pregnancy | FamiCord Suisse<\/title>\n<meta name=\"description\" content=\"What is the gestational sac and what is its role? 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