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Your first-trimester screening at 11 to 13 weeks: how to prepare

NNova editorial team · 4 min read

Most people need little special preparation for first-trimester screening. Bring your ID and any prior test results, and ask the clinic whether you need a full bladder or any other steps before the visit.

What the screening includes

First-trimester screening is usually done between 11 and 13 weeks. It often combines an ultrasound, which measures the back of the baby's neck (nuchal translucency) and checks development, with a blood test from the pregnant person. Together, these help estimate the chance of certain chromosomal conditions, such as Down syndrome, and confirm how far along the pregnancy is.

How to prepare

  • Bring your ID, insurance information and any prior prenatal records or test results
  • Ask the clinic whether a moderately full bladder is preferred for the ultrasound
  • Fasting is usually not needed, but confirm this with the clinic or lab
  • Wear comfortable clothing that is easy to lift or open for the scan
  • If nausea, fatigue or dizziness makes travel difficult, talk with the clinic ahead of time about options

What to keep in mind

Screening results estimate risk. They do not diagnose a condition. Results are usually interpreted together with gestational age, maternal age and ultrasound findings.

If your provider offers a follow-up test, such as NIPT (a blood test that checks fetal DNA in the pregnant person's blood) or a diagnostic test like chorionic villus sampling or amniocentesis, ask what it is for, what it can and cannot show, and what the risks are.
Contact your provider right away, before your visit if needed, for heavy vaginal bleeding, severe abdominal or pelvic pain, fever, fluid leaking from the vagina, or dizziness or fainting.

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General information only; it does not replace advice from your doctor or midwife.