AMNIOTIC FLUID Flashcards
(45 cards)
purpose of amniotic fluid examination: (2)
- extent of fetal distress and maturity
- ability of the fetus to survive and early delivery
membranous sac
that surrounds the fetus
amnion
functions of amniotic fluid (5)
- cushion
- fetal movement
- heat absorber
- lung development
- exchange of nutrient
amniotic fluid volume
1st trimester:
3rd trimester:
- 35mL
- 1L
absorption of amniotic fluid water
and solutes into the fetal vascular system
intramembranous flow
Excessive accumulation of amniotic fluid
from failure of fetus to swallow
polyhydramnios
Decreased amniotic fluid from increased
fetal swallowing
oligohydramnios
fetal age can be estimated by measuring _____
give also the values
creatinine
<36 weeks 1.5-2.0 mg/dL
>36 weeks >2.0 mg/dL
how to differentiate maternal urine vs amniotic fluid
creatinine, urea, glucose, and protein
amniotic fluid:
<3.5 mg/dL
<30 mg/dL
rgt strip + for protein and glucose
specimen collection volume and special consideration
a. 30
b. 40
c. 50
d. 60
- volume: 30 mL
- discard first 2-3mL because of maternal blood
- protect the spx from light
this test requires ice and cooled/frozen for up to 72 hrs if needed
fetal lung maturity test
these tests require aseptic collection and 37C temp
cytogenetic
microbiology
these tests needs centrifuge or filter fluid to remove debris
chemical tests
normal color of amniotic fluid
colorless with slight to moderate turbidity from cells
blood-streaked amniotic fluid
traumatic tap
intra-amniotic hemorrhage
test to differentiate maternal vs fetal blood
Kleihauer-Betke test
bright yellow amniotic fluid
increased bilirubin
dark green amniotic fluid
meconium
dark red brown amniotic fluid
fetal death
this fetal disease is commonly found on Rh (-) pregnant mothers
hemolytic disease of the newborn
when can HDN happen?
second pregnancy
which analyte is measured in case of HDN
bilirubin
liley graph zone I
mildly affected fetus
liley graph zone II
requires careful monitoring
