- First Trimester Screening: This includes a blood test and an ultrasound to measure nuchal translucency. It helps assess the risk of chromosomal abnormalities like Down syndrome. - Second Trimester Screening: Also known as the quad screen, this blood test measures levels of four substances. It helps detect neural tube defects and chromosomal abnormalities. - Non-Invasive Prenatal Testing (NIPT): This blood test analyzes fetal DNA in the mother's blood and is highly accurate in detecting conditions like Down syndrome, trisomy 18, and trisomy 13.
