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Questions and Answers
What is the primary purpose of amniocentesis?
What is the primary purpose of amniocentesis?
At what stage of pregnancy is chorionic villus sampling (CVS) typically performed?
At what stage of pregnancy is chorionic villus sampling (CVS) typically performed?
Which of the following conditions can NOT be diagnosed using chorionic villus sampling?
Which of the following conditions can NOT be diagnosed using chorionic villus sampling?
What is a key advantage of foetal blood sampling over other techniques?
What is a key advantage of foetal blood sampling over other techniques?
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What is a common risk associated with both amniocentesis and chorionic villus sampling?
What is a common risk associated with both amniocentesis and chorionic villus sampling?
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Study Notes
Amniocentesis
- Performed between the 16th and 20th week of pregnancy.
- 10-20ml of amniotic fluid is extracted using a needle inserted through the abdomen.
- Cells in the fluid are analyzed for potential biochemical defects and chromosomal abnormalities.
- Carries a small risk of infection, miscarriage, or damage to the fetus.
- Primarily used for women assessed at higher risk of having a child with a birth defect.
- Useful in detecting conditions such as Down syndrome, cystic fibrosis, neural tube defects (spina bifida), PKU, Tay-Sachs disease, sickle cell anemia, and Duchenne’s muscular dystrophy.
Chorionic Villus Sampling (CVS)
- Involves collecting a sample of fetal cells from the chorion through a needle or catheter.
- Can be performed between the 9th and 19th week of pregnancy.
- Allows for testing of biochemical defects and chromosomal abnormalities.
- Offers faster results compared to amniocentesis, crucial if termination of pregnancy is required for a specific defect.
- Potential disadvantages include a risk of miscarriage and infection, and it is not effective in diagnosing spina bifida.
Fetal Blood Sampling
- Enables direct access to fetal blood through a thin needle inserted through the abdominal wall into the umbilical vein.
- Facilitates quicker chromosome analysis.
- A sample of fetal blood is extracted to detect abnormalities such as Down syndrome, blood disorders, growth retardation, and metabolic disorders.
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Description
This quiz explores the procedures of amniocentesis and chorionic villus sampling (CVS) in prenatal diagnostics. Learn about the timing, methods, risks, and conditions detectable through these tests. Ideal for those studying maternal-fetal medicine or genetics.
