Microarray-based Chromosomal Analysis (Prenatal or Genetic Testing)

What Is This Test Used For?

Microarray testing is often used in prenatal care to screen for chromosomal abnormalities in babies, such as Down syndrome or other conditions. It may also be used in genetic counseling for adults with unexplained developmental delays, learning disabilities, or other health concerns. Some tests are performed on blood, amniotic fluid, or other samples to check for genetic variations that could impact health.

How Is the Sample Collected?

A small blood sample is typically taken from your arm using a needle. If this is part of prenatal testing, a sample may come from amniotic fluid or cord blood. The sample is then sent to a lab for analysis. Avoiding certain medications or supplements before testing may be advised by your healthcare provider.

What Does the Test Measure?

This test measures DNA fragments across the entire genome to identify microdeletions or duplications—changes in DNA that can be as small as a few hundred base pairs. These changes may not be visible on standard chromosomal tests but can cause health issues like developmental delays, heart problems, or other genetic disorders.

How Long Does It Take to Get Results?

Results are usually available within 2–4 weeks, depending on the lab and complexity of the test. Your healthcare provider will discuss the results with you and explain what they mean for your health or the health of your baby.