Chromosomal Analysis of Fetal Blood via G-Banding (Peripheral Blood Sample)

Why This Test Is Done

Your healthcare provider may recommend this test if you have a higher risk of having a baby with chromosomal conditions, such as due to advanced maternal age, previous genetic testing results, or certain family medical histories. It can also be performed if there are concerns about pregnancy complications or if you’ve experienced unexplained miscarriages.

How the Test Works

A small blood sample is taken from your baby during a prenatal procedure (like a cord blood sample or amniocentesis). The blood cells are then cultured and stained using a G-banding technique, which highlights the chromosomes’ patterns for detailed examination under a microscope.

What to Expect Before the Test

No special preparation is needed for this test. The procedure itself is typically done during a scheduled prenatal visit and may involve a minor needle insertion to collect the sample. Always inform your healthcare provider about any medications or health conditions that could affect the test results.

What to Expect During the Test

The blood sample is processed in a lab where technicians grow the cells for several days to allow chromosomes to replicate. Once ready, the chromosomes are stained and examined for structural abnormalities or numerical imbalances.