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22 Cards in this Set
- Front
- Back
When should you see a GS consistently?
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By TV at 5 wks, 1-2mm.
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What is the echogenic rim around the GS called?
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Trophoblastic reaction.
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What is the accuracy of the mean sac diameter?
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+/- 7days.
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What is the formula for mean sac diameter?
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L + H + W /3
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How do you measure the MSD?
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Inner to inner.
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A GS in the lower uterine segment has what?
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A poor prognosis.
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What should the wall of the GS measure?
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3mm or more. (<2 mm has a poor prognosis).
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How much does the GS grow per day?
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1mm.
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What is the earliest recognizable landmark after the GS?
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The YS. Should measure 6mm.
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When should you see the YS?
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By 5wks, until @ 10 wks.
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What does the YS do?
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It provides nourishment to the developing fetus. It's the 1st site of hematopoiesis, and the initial site of the production of alpha feto protein.
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Where is the YS located?
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Between the amnion and chorion, in the chorionic cavity.
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When should the fetal pole be recognized?
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Consitantly when it measures 4mm/ 5-6 menstrual wks.
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What is the accuracy of measuring the fetal pole?
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+/- 4-6d.
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When can you first see cardiac activity?
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As soon as the fetal pole is visualized. It should always be present in a fetal pole measuring 5mm or more.
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What is a normal heart rate from 5-6wks?
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100-120.
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What is a normal heart rate from 8-9wks?
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140-170.
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What is considered an acceptable heart rate after 9wks?
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120-160.
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When is the rhombencephalon visualized by?
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8-11wks.
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When do you measure for NT?
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With a CRL of 4.5-8.4cm.
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When does the corpus luteum of pregnancy regress?
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Starting @10wks and should be completely resolved by 16wks.
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When can you detect hCG?
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By 3 menstrual wks, and it begins to level off at @ 8wks then declines.
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