Gestational Sac Measurement
Gestational Sac Measurement - Related Videos
10:38
Isolation of Early Hematopoietic Stem Cells from Murine Yolk Sac and AGM
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Cited by 19 •
2008
This video shows how to micro-dissect the yolk sac and aorta-gonad-mesonephros region from embryos and use flow cytometry to sort hematopoietic stem cells.
04:34
Dissection of the Endolymphatic Sac from Mice
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Cited by 5 •
2021
This study describes how to dissect the endolymphatic sac from the inner ear of the mouse at different ages. The result of a similar dissection is shown in an Slc26a4-null mouse model of enlargement of the endolymphatic sac. A transgenic mouse with a fluorescent reporter expressed in the endolymphatic sac is presented as a model to readily visualize the endolymphatic sac, and educational tool.
04:34
Surgical Treatment of an Endolymphatic Sac Tumor
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Cited by 1 •
2023
Here, we discuss clinical and radiological features of endolymphatic sac tumors and report the methodology and results of a surgical removal in a case in care at our otologic referral center.
11:53
Primary Endodermal Epithelial Cell Culture from the Yolk Sac Membrane of Japanese Quail Embryos
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Cited by 6 •
2016
To study the mechanism of lipid utilization in yolk sac membranes during the late stages of avian embryonic development, we established a primary Japanese quail embryonic endodermal epithelial cell culture system.
01:22
Diabetes Mellitus: Type 2 and Gestational
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2024
Type 2 diabetes, characterized by insulin resistance, arises when the insulin receptors on cells lose responsiveness to insulin, diminishing the cell's capacity to take up glucose, resulting in elevated blood glucose levels. To receive a diagnosis of Type 2 diabetes, a series of blood glucose tests are necessary to assess whether the blood glucose falls within normal parameters. If the result is out of the normal range, a patient may be diagnosed as prediabetic or diabetic, depending on the...
FAQs
The sonographer records the sac in three dimensions rather than relying on a single length. These measurements are combined to calculate the mean sac diameter, which provides a more representative size estimate for comparison with expected gestational age. This approach helps characterize early pregnancy development when the sac is the principal structure being assessed.
Sac size provides only one part of the assessment. Comparing it with findings such as the yolk sac or embryo gives additional biological context for interpreting early pregnancy development. The relationship among these observations can help indicate whether growth follows an expected pattern, rather than basing interpretation on the diameter measurement alone.
A single measurement shows the sac at one point in time, whereas serial assessments reveal how its size and associated findings change. Tracking these observations allows researchers or clinicians to evaluate whether development follows an expected pattern. Repeated measurements therefore provide temporal context that an isolated result cannot supply.
The assessment begins by imaging the early pregnancy, often with transvaginal ultrasound when the pregnancy is still small. The sac is measured in three dimensions, and the values are used to calculate its mean sac diameter. The result is then compared with expected gestational age and with other visible findings, including the yolk sac or embryo.
Transvaginal imaging is typically used when the pregnancy is still small, making early structures suitable for focused ultrasound assessment. In that setting, the approach supports measurement of the sac and evaluation of accompanying findings such as the yolk sac or embryo. Its relevance is greatest during early monitoring, when developmental changes are being followed.
In biology and reproductive research, these measurements support early pregnancy dating and monitoring of embryonic development. Investigators can compare sac size with expected gestational age and examine whether growth follows expected patterns. Serial assessments add information about developmental progression, making the measurements useful for evaluating early pregnancy over time rather than describing only one observation.