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Exam (elaborations)

PART 4 Determination of Gestational Age CRL Multiple Gestations

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PART 4 Determination of Gestational Age CRL Multiple Gestations

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July 25, 2025
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Written in
2024/2025
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  • part 4 determination of gestational age crl

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




Age CRL Multiple Gestations !| !| !|




What are two parameters for sonographic gestational dating:
!| !| !| !| !| !| !|




1. Crown-rump length (CRL)
!| !| !|




2. Gestational sac size
!| !| !|




As a rule, GS size remains accurate through first ____ weeks of gestation
!| !| !| !| !| !| !| !| !| !| !| !|




8 weeks
!|




Sonographically, gestational sac size or mean sac diameter (MSD) !| !| !| !| !| !| !| !| !|




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




Length, width and height of gestational sac
!| !| !| !| !| !|




L + Width + Height / 3 = average sum
!| !| !| !| !| !| !| !| !|




CRL measurements can be obtained as early as 5½ weeks using _________
!| !| !| !| !| !| !| !| !| !| !| !|




sonography

Transvaginal

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




_______ measurements !|

, CRL

CRLs considered most accurate method for dating through ______ weeks of
!| !| !| !| !| !| !| !| !| !| !|




gestation

12 weeks
!|




After 12 weeks; fetus begins to "____", making CRL measurements of length
!| !| !| !| !| !| !| !| !| !| !| !|




more difficult
!|




Curl

What are first trimester risk assessment?
!| !| !| !| !|




- Amniocentesis
!|




- Triple Screen
!| !|




- Chorionic villi sampling
!| !| !|




- Nuchal translucency (NT) measurement
!| !| !| !|




What may be measured in standardized way?
!| !| !| !| !| !|




Nuchal Translucency (NT)
!| !|
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