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Amniocentesis
Aka: Amniocentesis
- See Also
- Antenatal Screening
- Definition
- Definitive, second trimester Antenatal Screening for fetal chromosomal abnormalities
- Indications
- Antenatal Screening for fetal chromosomal abnormalities for high risk pregnancies
- Protocol
- Timing
- Safest time period: 16-18 weeks gestation
- Range of sampling time: 14-20 weeks gestation
- Technique
- Amniotic fluid sampled transabdominally under Ultrasound guidance
- Adverse Effects
- Pregnancy loss (0.3 to 1% risk)
- Vaginal spotting
- Amniotic fluid leak
- Chorioamnionitis
- Fetal injury from Amniocentesis needle
- Failed procedure in which fetal cells in amniotic fluid do not grow in culture
- Efficacy: Down Syndrome detection
- Test Sensitivity: 99.4%
- References
- Anderson (2009) Am Fam Physician 79(2): 117-24
- Caughey (2006) Obstet Gynecol 108: 612-6