Role of sonography in OB Flashcards Preview

OB/Gyn > Role of sonography in OB > Flashcards

Flashcards in Role of sonography in OB Deck (18):
0

What is the primary tool to evaluate the fetus?

sonography

1

How is sonography used in OB?

to assess development, growth an well being of the fetus

2

What is the role of obstetric management?

it is altered to provide best care when sonography identifies problems

3

If conception is on day 14 (of 28 day cycle) what is the pregnancy duration?

from LNMP is 280 days or 40 weeks

4

how do you determine clinical dates?

first day of LNMP

5

What do you ask if patient is unsure of LNMP?

ask due date physician gave EDD

6

What is EDC?

estimated date of conception

7

The EDD is most accurate in what trimester?

first...under 20 weeks

8

Dates established by 1st trimester US should not be changed,when?

on consecutive US that assess growth

9

how are the three trimesters broken up?

first: up to 13 weeks 6 days gestational age (most accurate time for dating pregnancy by ultrasound

FINISH slide 10

10

what is nagele's rule?

a way to figure out the EDD

EDD = LNMP-3months + 7 days

LMP = EDD + 3 months - days

11

In first trimester when might you use doppler?

Only to determine fetal demise

error on the side of being safe and don't use doppler unless you absolutely must when the benefit out weighs the risk

12

What is the main reason for first trimester fetal scan?

viability

13

Cardiac motion usually seen when embryo is _______mm or larger?

5

****5 and ALIVE*****

14

polyhydrominos, oligohydrominos

know these!!

15

what is presenting baby?

the one closest to the cervix

16

what are the measurements of a first trimester?

heart rate

yolk sac

gestational sac

crl

17

what are the measurements taken for 2nd trimester?

BPD - biparietal diameter

HC - head circumference

AC - abdomen circumference

FL- femur length (after 14 weeks)

Heart-rate
FW - fetal weight (generated)