What type of genetic testing is amniocentesis?

It is the sampling method, not a single universal laboratory test. A clinician withdraws a small amount of amniotic fluid under ultrasound guidance, and the laboratory performs the analysis selected for the clinical question.

Prenatal screening estimates the chance of selected conditions and does not establish a diagnosis. Diagnostic analysis of an amniotic-fluid sample looks directly at fetal genetic material for the specified condition or chromosome change, producing a more definitive answer for what was tested.

The test menu can include a rapid analysis for selected chromosome differences, a full chromosome assessment, a chromosomal microarray or a test aimed at a particular gene. Not every patient needs every analysis, and broader testing can identify findings whose meaning is uncertain.

Before agreeing, ask the fetal medicine or genetics team to name each proposed laboratory analysis and the conditions it can and cannot detect. Explain any known genetic diagnosis in either biological parent, a previous affected pregnancy or relevant family history, because targeted testing may require advance laboratory planning.

Consider how you would use a confirmed, negative or uncertain result. Genetic counselling can help interpret the limits of the analysis, possible implications for relatives and whether parental samples might be requested to clarify a finding.

Contact your maternity unit urgently after amniocentesis if amniotic fluid may be leaking, you develop vaginal bleeding, fever, chills, intensifying abdominal pain, contractions or a marked sense of being unwell. If fetal movements are already established, seek assessment for a clear decrease from the baby's normal pattern. Call emergency services for severe or rapidly worsening symptoms.

Find out whether results arrive in stages, how uncertain or incidental findings are handled, and who will discuss them with you. Ask whether the sample could need additional analysis, whether another family member's sample is relevant and how the result may alter pregnancy or newborn care.