Gestational sac

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The gestational sac (GS) is the first sign of early pregnancy on ultrasound and can be seen with endovaginal ultrasound at approximately 3-5 weeks gestation when its mean sac diameter (MSD) measures approximately 2-3 mm in diameter.

Some suggest that if the beta-hCG level is >1800 mIU/ml (second international standard) a transabdominal ultrasound should be able to identify an intrauterine gestational sac, however, this value is debatable, and beta-hCG levels >2000 (or even >3000) without a visualized intrauterine gestational sac does not rule out intrauterine pregnancy ⁴. Treatment should not be initiated on a hemodynamically stable woman on the basis of a single beta-hCG level ⁵.

A true gestational sac be distinguished from a pseudogestational sac by noting:

its normal eccentric location: it is embedded in endometrium, rather than centrally within the uterine cavity
presence of a yolk sac: seen at approximately 5.5 weeks
presence of the double decidual sign (most helpful at 4-6.5 weeks)

However, caution should be exercised with a diagnosis of a pseudogestational sac. In a woman with a ~~postive~~positive beta-hCG, any intrauterine sac-like fluid collection seen on ultrasound is highly likely to be a gestational sac ³.

A normal gestational sac grows by 1 mm per day.

-The gestational sac (GS) is the first sign of <a href="/articles/early-pregnancy">early pregnancy</a> on ultrasound and can be seen with endovaginal ultrasound at approximately 3-5 weeks gestation when its <a href="/articles/mean-sac-diameter">mean sac diameter (MSD</a>) measures approximately 2-3 mm in diameter.Some suggest that if the <a title="Beta-hCG levels" href="/articles/beta-hcg-levels">beta-hCG level</a> is >1800 mIU/ml (second international standard) a transabdominal ultrasound should be able to identify an intrauterine gestational sac, however, this value is debatable, and beta-hCG levels >2000 (or even >3000) without a visualized intrauterine gestational sac does not rule out intrauterine pregnancy 4. Treatment should not be initiated on a hemodynamically stable woman on the basis of a single beta-hCG level 5.A true gestational sac be distinguished from a <a href="/articles/pseudogestational-sac-1">pseudogestational sac</a> by noting :<ul>
+The gestational sac (GS) is the first sign of <a href="/articles/early-pregnancy">early pregnancy</a> on ultrasound and can be seen with endovaginal ultrasound at approximately 3-5 weeks gestation when its <a href="/articles/mean-sac-diameter">mean sac diameter (MSD</a>) measures approximately 2-3 mm in diameter.Some suggest that if the <a href="/articles/beta-hcg-levels">beta-hCG level</a> is >1800 mIU/ml (second international standard) a transabdominal ultrasound should be able to identify an intrauterine gestational sac, however, this value is debatable, and beta-hCG levels >2000 (or even >3000) without a visualized intrauterine gestational sac does not rule out intrauterine pregnancy 4. Treatment should not be initiated on a hemodynamically stable woman on the basis of a single beta-hCG level 5.A true gestational sac be distinguished from a <a href="/articles/pseudogestational-sac-1">pseudogestational sac</a> by noting:<ul>
-</ul>However, caution should be exercised with a diagnosis of a pseudogestational sac. In a woman with a postive beta-hCG, any intrauterine sac-like fluid collection seen on ultrasound is highly likely to be a gestational sac 3.A normal gestational sac grows by 1 mm per day.<h4>See also</h4><ul>
+</ul>However, caution should be exercised with a diagnosis of a <a title="Pseudogestational sac" href="/articles/pseudogestational-sac-1">pseudogestational sac</a>. In a woman with a positive beta-hCG, any intrauterine sac-like fluid collection seen on ultrasound is highly likely to be a gestational sac 3.A normal gestational sac grows by 1 mm per day.<h4>See also</h4><ul>