How is chromosome testing performed?

In daily life, people often refer to “chromosome health examinations,” yet many are not fully aware of what this entails or how chromosomal testing is performed.

How Is Chromosomal Testing Performed?

Chromosomal analysis is typically conducted using cytogenetic methods—or molecular cytogenetic techniques—to examine chromosomes. Following the test, results are interpreted to assess chromosomal integrity. Chromosomal abnormalities may lead to fetal malformations or developmental disorders, potentially resulting in miscarriage or neonatal death. Generally, pregnant women undergo Down syndrome screening between the 16th and 20th weeks of gestation (i.e., approximately 4–5 months). This examination should be performed at a reputable obstetrics and gynecology hospital, utilizing specialized diagnostic methods—such as amniocentesis. After the procedure, patients may feel physically weak and should rest in bed; follow-up visits to the hospital for re-evaluation are recommended.

Chromosomal testing is usually performed via venipuncture (blood draw). In females, the test primarily evaluates autosomes and sex chromosomes. It is commonly indicated for individuals experiencing recurrent miscarriages or those with congenital anomalies of the reproductive organs. Prior to testing, patients must fast for at least 12 hours and abstain from drinking water for at least 6 hours.

Chromosomal testing can be categorized into invasive and non-invasive methods. Common invasive procedures include blood sampling and amniocentesis, whereas non-invasive approaches may utilize samples such as hair follicles or fingernail clippings. We hope this information has been helpful!