Radswiki et al.

Amniocentesis, also known as amniotic fluid testing or AFT, is a diagnostic or therapeutic medical procedure primarily used in prenatal diagnosis of chromosomal abnormalities and fetal infections.

A small amount of amniotic fluid (15-20 ml), which contains fetal tissue, is extracted from the amniotic sac surrounding a developing fetus, and the fetal DNA is examined for genetic abnormalities. It is usually performed under ultrasound guidance and is performed between the 15th-20th week of pregnancy. If performed after 20 weeks it is often termed a late amniocentesis.

  • prenatal genetic studies
  • assessment of fetal lung maturity
  • TORCH infection or chorioamnionitis
  • haemoglobinopathies and degree of hemolytic anaemia
  • blood or platelet type
  • neural tube defects
  • therapeutic amniocentesis: to remove excess amniotic fluid in symptomatic polyhydramnios or twin-to-twin transfusion syndrome
Potential risks

See also

Ultrasound - obstetric
Share article

Article information

rID: 14699
System: Obstetrics
Tag: cases
Synonyms or Alternate Spellings:
  • Amniotic fluid testing
  • AFT
  • Amniotic fluid testing (AFT)

Support Radiopaedia and see fewer ads

Updating… Please wait.

Alert accept

Error Unable to process the form. Check for errors and try again.

Alert accept Thank you for updating your details.