Why Prenatal Testing Matters
Prenatal tests help you and your provider monitor your health and your baby's development throughout pregnancy. Some tests are routine for everyone; others are optional and depend on your personal risk factors, family history, and preferences. Understanding what's available helps you make informed decisions.
Routine Tests for Everyone
These are standard at most prenatal visits:
- Blood tests — blood type, Rh factor, complete blood count, and screening for infections
- Urine tests — check for protein, sugar, and signs of infection
- Blood pressure checks — at every visit, to monitor for preeclampsia
- Ultrasounds — typically one in the first trimester and an anatomy scan around 20 weeks
- Glucose screening — around 24–28 weeks, to check for gestational diabetes
- Group B Strep (GBS) test — around 36 weeks
Screening vs. Diagnostic Tests
It's important to understand the difference:
- Screening tests estimate the chance of a condition — they don't give a yes or no answer. Examples include first-trimester screening, the quad screen, and cell-free DNA (NIPT).
- Diagnostic tests give a more definitive answer but carry a small risk of complications. Examples include chorionic villus sampling (CVS) and amniocentesis.
ASK YOUR PROVIDER
Ask your provider which tests they recommend, what the results mean, and what your options are if a screening test comes back with an increased risk.
Genetic Screening Options
Several screening options are available. Cell-free DNA testing (NIPT) is a blood test that screens for certain chromosomal conditions. It's highly accurate for screening but is not a diagnostic test. Your provider can help you decide if it's right for you.
What You Can Do
- Write down questions before each prenatal visit
- Ask what each test is for and what the results mean
- Discuss your family history with your provider
- Remember: you can decline any optional test
