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16 Cards in this Set
- Front
- Back
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Naegele's rule
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First day of patient's last menstrual period (first day of bleeding), plus one year and seven days, minus three months
EDD = (LMP + 1y + 7d) - 3m |
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What term is applied to the so-called "mask of pregnancy?"
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chloasma/melasma gravidarum
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At what gestational age does the fundus of the uterus become palpable above the pubic symphysis?
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12 weeks (grapefruit)
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At what gestational age can fetal movement be appreciated?
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20 weeks in primigravida
18 weeks in multipara |
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In what percentage of pregnancies does morning sickness occur?
At what stage of gestation is it most prominent? |
75-80%
2-12 weeks of gestation |
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What is Chadwick's sign?
Why does it occur? |
bluish discoloration of the vaginal and cervical mucosa
due to vascular congestion in pregnancy |
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What are the consequences of the persistent vomiting of hyperemesis gravidarum?
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weight loss
dehydration acidosis (from starvation) alkalosis (from loss of HCl in vomitus) hypokalemia |
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What is the function of human chorionic gonadotropin (hCG)?
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helps sustain corpus luteum during first seven weeks (placenta makes own hormones thereafter)
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How many days after fertilization can hCG be detected in maternal serum or urine?
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6-12 days (3-3.5 weeks after LMP)
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What is the rate of increase of hCG in the first 10 weeks?
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increases 66-100% every 48 hours
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What other conditions could result in hCG detected by pregnancy tests?
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hydatidiform mole
choriocarcinoma germ cell tumors hCG produced by breast cancers and large cell carcinoma of the lung |
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Above what hCG level can a gestational sac be visualized by transvaginal ultrasound?
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>1500 mIU/mL
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What is the threshold for a urine pregnancy test to detect hCG?
What is the sensitivity of this test? |
25 mIU/mL
95% sensitivity by 1 week after first missed menstrual period |
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When is plasma hCG preferable to urine hCG measurement?
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to aid in Dx of ectopic pregnancy
monitoring trophoblastic tumors screening for fetal abnormalities serial levels to monitor accidents of pregnancy (SAB, MAB, ectopic) |
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When is US dating most accurate?
When is crown-rump length most accurate? |
first trimester (+/- 4 days)
first trimester (+/- 4 days) |
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At what gestational age can Doppler detect fetal heart tones?
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10 weeks
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