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Day 64 of 280 · 9 weeks + 1 day

Screening, explained once

Last reviewed · 3 min read · 8 sources · Plain-text version

Nine weeks and a day. Prenatal screening starts to come up around now. One plain explanation of what it is, what it isn't, and the question to ask at your visit.

Size this week
about the size of a strawberry
Length this week
around 22 mm from head to bottom
A woman in her thirties at a bright kitchen counter reading a printed leaflet with a pen in hand, her partner pouring tea beside her, morning light.

Nine weeks and a day. Over the next few weeks you will be offered screening, and it tends to arrive as a form rather than a conversation. Here is the conversation, once, so the form makes sense.

Your baby

A single ripe strawberry with its green cap on a plain pale wooden table, soft window light.

Around 22mm from head to bottom, with the major organs and bones developing and the face, hands and feet forming (NHS). Screening looks at this baby's chromosomes from the outside, through your blood and a scan, which is why it can estimate but not answer.

Your body

Two screens can start around now. Nuchal translucency screening is an ultrasound done around 9 to 13 weeks to look for signs of Down syndrome or other problems, often combined with blood tests (MedlinePlus). Cell-free DNA screening is a blood test that analyses fetal DNA in your bloodstream; it can be done as early as the 10th week and is most often used for Down syndrome (trisomy 21), Edwards syndrome (trisomy 18) and Patau syndrome (trisomy 13) (MedlinePlus).

The word that matters is "screening". A negative result means it is unlikely your baby has one of these conditions; a positive result means increased risk, and cannot confirm a diagnosis (MedlinePlus). All women are offered genetic screening in the first trimester (MedlinePlus), and MedlinePlus's line on cfDNA is that "you and your provider should discuss if a cfDNA screening is right for you" (MedlinePlus).

Try today

  1. The screening question

    Time: 5 minutes

    1. On the top of your visit list, write: "Which screening do you offer, and what would a positive result lead to?"

    2. Under it, write what you would want to know from a result, and what you would rather not know yet. Both are allowed.

    3. Add one more line: "Can I say no, or decide later?" The decision is meant to be a discussion between you and your provider (MedlinePlus).

    4. Leave the page there. You don't have to answer any of it today.

    Make it work:

    If you're offered a form before anyone explains it, you can ask for the explanation first.

Watch for

  • Normal

    nausea that can turn up at any time of day, not only mornings (NICHD).

    Call your provider

    for significant nausea and vomiting; it is on MedlinePlus's list of reasons to call in the first trimester (MedlinePlus).

  • Normal

    headaches, which are common in pregnancy; ask before taking a medicine for one (MedlinePlus).

    Call your provider

    for a headache that won't go away or gets worse over time (CDC).

  • Normal

    needing to pee more often, because of hCG and extra blood flow to the pelvis (NICHD).

    Call your provider

    for pain when passing urine (MedlinePlus).

For you

Screening is optional, and the weighing is yours. Some people want every number; some want only what would change a decision; some want to wait for the scan. CDC's framing is that screening tests "can help identify whether there may be a birth defect or other concern" (CDC), which is a tool, not an obligation.

If you're the partner: don't settle this one by text. Sit down with the question and work out together what you'd each do with a result before anyone draws blood.

Sources

This guide is general education that summarizes published research and guidance from groups like the American Academy of Pediatrics, the CDC, and the WHO. It isn’t medical advice, and every child develops on their own timeline. Your pediatrician knows your child; if something feels wrong, call them. In an emergency, call 911.

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