DIAGNOSTICS (3) Flashcards
chorionic villi sampling - CST
transcervical or transabdominal insertion of a needle into the fetal portion of the placenta.
chorionic villi sampling
cvs is performed at what weeks gestation?
8-12wks
what are examined to detect chromosome abnormalities and genetic disorders such as?
- chorionic villi cells
- down syndrome
- cystic fibrosis
this is done at 8-10 wks of pregnancy wherein chorionic cells are located by ultrasound
biopsy & analysis of chorionic villi for chromosomal analysis
what is the other term for chorionic villi sampling?
biopsy of placenta
as a nurse on duty, what should you instruct your client after the chorionic villi sampling procedure?
to report bleeding, infection, or leakage of fluid after procedure
(CVS)
as a nurse on duty, you should be aware of the reportable s/sx the patient should look out for. what are these?
- chills or fever (infection)
- uterine contraction / vaginal bleeding (threatened miscarriage)
what test involves measurement of AFP, estriol, and hCG in maternal serum?
AFP/Triple Screen
at what week of gestation is AFP/Triple Screen is being tested? and what is its purpose?
- 15-20wks
- screen for fetal structural & chromosomal abnormalities
what is alpha-feto protein?
substance produced by the liver that is present in the amniotic fluid and maternal serum
if this is detected as abnormal, the woman is next referred for ultrasound to confirm gestational age and to evaluate neural tube defects & other structural abnormalities.
estriol
what is often associated with Trisomy 21 (down syndrome) ?
low estriol, elevated hCG, low AFP
what is associated if the fetus has an open spinal or abdominal defect?
high in maternal serum (MSAFP)
this test assess fetal well-being that analyses the response of the fetal heart to fetal movement.
non-stress test (NST)
what does accelerations of FHR with fetal movement indicates?
the fetus has adequate oxygenation and intact CNS