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Flashcards in Module 5 : OB Introduction Deck (12)
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1

first trimester length

0 - 13 weeks 6 days LMP ( 13 6/7 weeks)

2

why ultrasound for OB

- can confirm viability
+ fetal heart activity
- dating
+ crown rump measurement (CRL)
- number of embryos
+ twins, triplets, etc

3

importance of dating

- LMP used to calculate how many weeks and days a pregnancy is
- some menstrual cycles last longer than 28 days, others are shorter
- so we use first day of LMP because it is most accurate
- only certain testing done at specific times
- inaccurate dates lead to false positives or negatives

4

first trimester screening tests

- nuchal translucency test
- maternal blood work

5

nuchal translucency test

- tested before 14 weeks LMP
- measures amount of fluid behind baby's neck ( over 3mm abnormal)

6

nuchal translucency assessment

can asses for
- chromosomal abnormalities
- heart abnormalities
- lung abnormalities
- skeletal abnormalities
- congenital infections
- blood disorders
- metabolic disorders

7

second trimester

14 weeks - 27 weeks 6 days LMP
* ALL ABOUT STRUCUTRES

8

second trimester screening

- 18 week detailed ultrasound
- all measurements and structures
- head, spine, abdomen, chest, femur, humerus, Anke, hand, placenta, umbilical chord, maternal uterus and cervix

9

third trimester

28 weeks - 40 completed (41) weeks LMP
- monitering growth

10

third trimester screening

- anatomy images not reassessed if normal
- monitoring for fetal well being (safe environment)
- measure for growth
- fetal heart rate
- biophysical profile
- placenta
- doppler if needed
- vessel samples

11

maternal testing - blood work

- first trimester screen + Nuchal
+ PAPPA and hCG
- 16 weeks
+ triple screen and quad screen
- 24-28 weeks
+ glucose tolerance screen
- gestational diabetes

12

routine doctor visits

- maternal weight, BP, urine
- uterine fundal height measurements
- position of baby
- fetal heart rate
- monthly at beginning - every 2 weeks if normal till 36 weeks - weekly if normal till term
- post dates ( overdue) require ultrasounds to check fetal well being and growth