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  2. Chorionic villus sampling - Wikipedia

    en.wikipedia.org/wiki/Chorionic_villus_sampling

    It entails sampling of the chorionic villus (placental tissue) and testing it for chromosomal abnormalities, usually with FISH or PCR. CVS usually takes place at 10–12 weeks' gestation, earlier than amniocentesis or percutaneous umbilical cord blood sampling. It is the preferred technique before 15 weeks. [2]

  3. Prenatal testing - Wikipedia

    en.wikipedia.org/wiki/Prenatal_testing

    Chorionic villus sampling: Involves getting a sample of the chorionic villus and testing it. This can be done earlier than amniocentesis, but may have a higher risk of miscarriage, estimated at 1%. After 10 weeks More invasive Amniocentesis: This can be done once enough amniotic fluid has developed to sample. Cells from the fetus will be ...

  4. Chorionic villi - Wikipedia

    en.wikipedia.org/wiki/Chorionic_villi

    The chorionic villi are at first small and non-vascular. 13–15 days: trophoblast only [1] Secondary: The villi increase in size and ramify, while the mesoderm grows into them. 16–21 days: trophoblast and mesoderm [1] Tertiary: Branches of the umbilical artery and umbilical vein grow into the mesoderm, and in this way the chorionic villi are ...

  5. Transcervical - Wikipedia

    en.wikipedia.org/wiki/Transcervical

    Transcervical refers to a transluminal procedure through the cervix of the uterus, including: Transcervical sterilization Transcervical chorionic villus sampling

  6. Amniocentesis - Wikipedia

    en.wikipedia.org/wiki/Amniocentesis

    Amniocentesis or chorionic villus sampling is necessary to conclusively diagnose the majority of genetic disorders, with amniocentesis being the gold-standard procedure after 15 weeks' gestation. [3] Transabdominal chorionic villus sampling is an alternative to amniocentesis if genetic diagnostic testing is to be performed in the first ...

  7. DNA paternity testing - Wikipedia

    en.wikipedia.org/wiki/DNA_paternity_testing

    It is possible to determine who the biological father of the fetus is while the woman is still pregnant through procedures called chorionic villus sampling or amniocentesis. Chorionic villus sampling retrieves placental tissue in either a transcervical or transabdominal manner.

  8. Determination of sex - Wikipedia

    en.wikipedia.org/wiki/Determination_of_sex

    Cell-free fetal DNA testing, wherein a venipuncture is performed on the mother to analyze the small amount of fetal DNA that can be found within it. Chorionic villus sampling (CVS) and amniocentesis , which are two rather invasive testing procedures.

  9. Fetal membranes - Wikipedia

    en.wikipedia.org/wiki/Fetal_membranes

    The chorionic membrane is a fibrous tissue layer containing the fetal blood vessels. [4] Chorionic villi form on the outer surface of the chorion, which maximise surface area for contact with maternal blood. [4] The chorionic villi are involved in fetal-maternal exchange. [10]