Normal Gestational Sac Diameter Size on Ultrasound
Normal gestational sac diameter on ultrasound follows the Age − 30 mm rule in the first trimester, with key thresholds guiding early pregnancy assessment.
First Trimester
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Normal Nuchal Translucency Size on Ultrasound 11–14 Weeks
Normal nuchal translucency measures less than 3 mm on ultrasound between 11–14 weeks, with values above this threshold raising concern for chromosomal abnormalities.
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