OB Procedures

Question 1

What is a Genetic Sonogram? when is this done?

Answer 1

done at 18-20 wks to check for anatomic markers of fetal aneuploidy including: structural abnormalities, nuchal skin fold thickness, short long bones, etc

Question 2

What are Nuchal Translucency(NT) measurements? when is this done ?

Answer 2

done between 10-14 wks = looks for thickened NT = shows likely aneuploidy

Question 3

whats Chorionic Villus Sampling(CVS)? when is this done? why?

Answer 3

U/S giuded samping of chorinonic villi = done between 10-12 wks = done for karyotyping

Question 4

Amniocentesis. Whens this done? why?

Answer 4

U/S guided amio sampling, done after 15 wks, takes living fetal cells = fetal karyotpying, NTD screening,

Question 5

Whats a Percutaneous Umbilical Blood Sample? Whats this used for? when can it be done?

Answer 5

transabdominal procedure done under U/S guidanace to sample fetal blood from umbilical vein after 20 wks. Done for karyotyping, looking at IgG, can be used to give transfusions. prego loss risk 1-2%

Question 6

Fetoscopy. When is this done? WHy?

Answer 6

done after 20 wks, bascially fetal surgery or skin biopsy. prego loss risk 2-5%