What are the risks and benefits of amniocentesis?

Amniocentesis is an invasive prenatal diagnostic procedure involving the extraction of amniotic fluid via a needle inserted through the abdomen into the uterus, typically performed between the 15th and 17th weeks of gestation.123

Benefits

The primary benefit of amniocentesis is its ability to provide a wealth of diagnostic information by analyzing fetal cells and fluid. It is highly effective for:3
* Genetic Diagnosis: Identifying chromosomal abnormalities (such as Down syndrome) and over 50 metabolic diseases.123
* Structural Screening: Detecting neural tube defects like spina bifida and anencephaly.142
* Fetal Assessment: Determining fetal sex, which is critical for managing sex-linked inherited diseases.12
* Accuracy: Because the cells are embryonic in origin, they provide a more accurate representation of the fetus's genetic constitution compared to other sampling methods.3

Risks

While generally regarded as safe, the procedure carries inherent risks, including:
* Fetal Loss: The most significant risk is the potential for miscarriage, which may result from complications such as placental disruption.23
* Procedural Complications: Patients may experience side effects ranging from mild cramping to infection.3
* Timing: Results can take several weeks, often delaying diagnosis until the 19th week of pregnancy or later, which may complicate medical or personal decision-making.3