Home / Blood Tests / Down Syndrome: A-Test (15-22 Week, 2nd Trimester, Triple Test)

Down Syndrome: A-Test (15-22 Week, 2nd Trimester, Triple Test)

What Are Prenatal Screening Tests?

Prenatal screening tests are designed to assess the risk of certain genetic and chromosomal conditions in a developing baby. These tests are typically performed during the first and second trimesters of pregnancy.

Blood-Based Screening for Chromosomal Conditions

One of the key components of prenatal screening involves analysing the levels of specific proteins and hormones found in the mother’s blood. These biomarkers can indicate the likelihood of conditions such as Down’s syndrome (Trisomy 21), Edwards’ syndrome (Trisomy 18), and Patau’s syndrome (Trisomy 13).

Common Markers Measured

Pregnancy-Associated Plasma Protein A (PAPP-A)

Free Beta-hCG (Human Chorionic Gonadotropin)

Alpha-fetoprotein (AFP)

Estriol and Inhibin A (in second trimester)

These markers are evaluated to calculate the risk of fetal abnormalities and help determine if further diagnostic testing is needed.

Prenatal Blood Screening in Slough and Surrounding Areas

Private pregnancy screening that includes blood tests for protein and hormone levels is available across Slough, Windsor, Langley, Maidenhead, and surrounding Berkshire areas. If you're seeking early, accurate screening during pregnancy, local diagnostic services in Slough offer professional support and personalised care. Contact the clinic or laboratory directly to arrange an appointment.

There is an additional £20 phlebotomy fee for every donation.