PART 4 Determination of Gestational Age CRL Multiple Gestations

PART 4: Determination of Gestational !| !| !| !| !|




Age CRL Multiple Gestations !| !| !|




What are two parameters for sonographic gestational dating:
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1. Crown-rump length (CRL)
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2. Gestational sac size
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As a rule, GS size remains accurate through first ____ weeks of gestation
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8 weeks
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Sonographically, gestational sac size or mean sac diameter (MSD) !| !| !| !| !| !| !| !| !|




determined by average sum of what? !| !| !| !| !|




Length, width and height of gestational sac
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L + Width + Height / 3 = average sum
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CRL measurements can be obtained as early as 5½ weeks using _________
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sonography

Transvaginal

Visualization of embryonic heart motion is marker signifying beginning of
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_______ measurements !|

, CRL

CRLs considered most accurate method for dating through ______ weeks of
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gestation

12 weeks
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After 12 weeks; fetus begins to "____", making CRL measurements of length
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more difficult
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Curl

What are first trimester risk assessment?
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- Amniocentesis
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- Triple Screen
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- Chorionic villi sampling
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- Nuchal translucency (NT) measurement
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What may be measured in standardized way?
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Nuchal Translucency (NT)
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