Obstetrics Book

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Chorionic Villus Sampling

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  1. See Also
    1. Antenatal Screening
  2. Definition
    1. Definitive, first trimester Antenatal Screening for fetal chromosomal abnormalities
  3. Indications
    1. Antenatal Screening for fetal chromosomal abnormalities for high risk pregnancies
  4. Protocol
    1. Performed between 10-13 weeks gestation
    2. Placental tissue sampling techniques
      1. Transabdominal sampling
      2. Transcervical sampling
        1. Higher Incidence of pregnancy loss than with abdominal sampling
        2. Indicated if placenta posterior or bowel blocks abdominal sampling
  5. Adverse Effects
    1. Pregnancy loss
      1. Risk: 0.6 to 4.6% (higher rate than with Amniocentesis)
    2. Limb reduction defects
      1. Gestational age 10-13 weeks: Risk does not exceed general population risk (6 per 10,000)
      2. Gestational age <10 weeks: 1-2% risk of limb reduction defect
  6. Efficacy: Down Syndrome detection
    1. Test Sensitivity: 97.8%
    2. Test Specificity: 98-99%
  7. References
    1. Anderson (2009) Am Fam Physician 79(2):117
    2. Caughey (2006) Obstet Gynecol 108:612

Chorionic Villi Sampling (C0008509)

Definition (MSH)A method for diagnosis of fetal diseases by sampling the cells of the placental chorionic villi for DNA analysis, presence of bacteria, concentration of metabolites, etc. The advantage over amniocentesis is that the procedure can be carried out in the first trimester.
Definition (CSP)technique to sample fetal tissue for genetic analysis; may be performed after 6 weeks gestation, which is earlier than amniocentesis, facilitating elective abortion.
ConceptsDiagnostic Procedure (T060)
MSHD015193
EnglishChorionic Villi Biopsies, Chorionic Villi Biopsy, Chorionic Villi Sampling, Chorionic Villi Samplings, Chorionic Villus Sampling, Chorionic Villus Samplings, CVB - Chorionic villus biopsy, CVS, CVS - Chorionic villus sampling, Sampling of chorionic villus
Spanishobtencion de muestra de vellosidades corionicas
Parent ConceptsPrenatal Diagnosis (C0033053), Specimen collection (C0200345), Biopsy (C0005558), Cytodiagnosis (C0010799), Puncture procedure (C0034117), removal technique (C0015252), Operation on placenta (C0404313), Duplicate concept (C1274013)
SourcesAOD, CSP, LNC, MEDLINEPLUS, MSH, MTH, SCTSPA, SNOMEDCT
Derived from the NIH UMLS (Unified Medical Language System)



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