Amniocentesis
Amniocentesis is a specialized prenatal diagnostic procedure in which a small sample of amniotic fluid surrounding the baby is collected using a thin needle under continuous ultrasound guidance. The sample can be tested for certain chromosomal and genetic conditions and other conditions when clinically indicated. It is generally performed after 16 weeks of pregnancy, with the exact timing depending on the clinical situation.
Ultrasound-Guided Procedure
Specialized Assessment
Amniocentesis
Chromosomal Conditions
Genetic Conditions
Structural Abnormality Assessment
High-Chance Screening Results
Previous Pregnancy History
Family History
Suspected Fetal Infection
Genetic Counselling Support
When Is It Recommended?
Amniocentesis is not routinely required for every pregnancy. It may be recommended when diagnostic testing is appropriate, particularly when there is an increased genetic risk, such as a **1 in 300 or higher-risk result**, based on screening results, ultr
- It may be offered after a high-chance prenatal screening result.
- It may be recommended when an ultrasound scan identifies a finding that requires further investigation.
- It may be considered when there is a previous pregnancy affected by a chromosomal or genetic condition.
- It may be recommended when one or both parents have a known risk of passing on a particular genetic condition.
- It may be used to investigate certain suspected fetal infections when clinically indicated.
Important Information
Amniocentesis is an invasive diagnostic procedure and should only be performed after appropriate counselling and discussion of its potential benefits, limitations and risks.
- Amniocentesis is a diagnostic test and can provide more definitive information about specific conditions than screening tests.
- It cannot test for every genetic, chromosomal or developmental condition.
- The specific laboratory tests performed depend on the reason for the procedure.
- There is a small risk of miscarriage following amniocentesis. Current NHS information estimates this at around 1 in 200 pregnancies, although individual risk can vary.
- Infection is a rare complication of the procedure.