Prenatal Screening Blood Test (First Trimester)

This test is done to help your doctor understand how well a certain part of your body is working and to look for signs of disease, infection, or other conditions that may need treatment. Knowing why the test is being done can help you feel more prepared and confident about your care.

The first-trimester prenatal screening is typically performed between 10 and 14 weeks of pregnancy. It combines blood tests and ultrasound to evaluate your risk for conditions like Down syndrome, trisomy 13, and trisomy 18, as well as neural tube defects. This test is not diagnostic but helps guide further evaluation if needed.

During the test, a trained member of your care team will explain each step before it happens. The procedure is usually quick, and most people feel little or no discomfort. You may be asked to lie still, breathe in a certain way, or hold a position briefly while images are taken or a sample is collected.

You’ll have a simple blood draw, usually taken from a vein in your arm. The sample is sent to a lab for analysis. The test takes about 15 minutes, and you can resume normal activities afterward. No special preparation is required, but inform your healthcare provider if you’re taking any medications or have bleeding tendencies.

This test measures specific values in your body, such as levels, counts, or how well certain organs are functioning. Your doctor compares these values with standard reference ranges to see whether anything looks unusual and whether additional testing or treatment might be helpful for you.

The test measures specific substances in your blood, including hormones like human chorionic gonadotropin (hCG) and pregnancy-associated plasma protein-A (PAPP-A), which are linked to early pregnancy development. It also evaluates other markers that may indicate chromosomal or structural abnormalities.

Your care team will give you specific instructions before the test. You may need to avoid eating or drinking for several hours, temporarily pause certain medicines, or wear loose, comfortable clothing. Plan to arrive a little early so there is time to check in, and follow all timing instructions closely to ensure accurate results.

No specific preparation is needed, but it’s important to confirm your due date and pregnancy timeline with your healthcare provider. If you have a history of pregnancy complications or family history of genetic conditions, you may be advised to proceed with additional testing.