Can I Get Paternity Testing During Pregnancy?

Yes, paternity testing during pregnancy is possible through modern prenatal methods, but establishing legal parentage in Washington is a separate matter that generally happens at or after birth.

The Short Answer

If you are an expectant parent in Snohomish County wondering whether you can confirm paternity before your child arrives, the answer on the medical side is yes. Prenatal paternity testing exists and has become far less invasive than it once was. The answer on the legal side is more nuanced. Confirming a biological connection during pregnancy and establishing legal parentage under Washington law are two different things, and the second usually waits until the child is born.

How Prenatal Paternity Testing Works

Prenatal paternity testing has changed significantly over the past decade. The method most people encounter today is noninvasive prenatal testing, sometimes shortened to NIPT. It works by analyzing a sample of the pregnant mother's blood, which carries small fragments of the baby's genetic material, alongside a sample from the potential father, usually collected with a simple cheek swab. Because it relies only on a blood draw, it avoids the risks associated with older procedures that required collecting fluid or tissue directly from the uterus.

Those older, invasive methods, such as amniocentesis and chorionic villus sampling, are medical procedures typically performed for reasons unrelated to paternity, and they carry a small risk to the pregnancy. Most people seeking paternity information during pregnancy today are steered toward the noninvasive blood-based option for that reason. These are medical and laboratory questions best discussed with a qualified physician or a testing provider, who can explain timing, accuracy, and what a given test can and cannot tell you.

Can a Court Order Paternity Testing Before Birth?

This is where the legal picture and the medical picture diverge. In Washington, a court's authority to order genetic testing arises inside a parentage proceeding, meaning a formal case filed to determine who a child's legal parents are. Under RCW 26.26A.310, when someone brings such a proceeding, the court will generally order the child and any other named individual to submit to genetic testing if a party's sworn statement alleges a reasonable possibility that the individual is, or is not, the child's genetic parent.

The important limitation for expectant parents is written directly into the same statute. RCW 26.26A.310 states that a court or a child support agency may not order in utero genetic testing. In plain terms, while private prenatal testing may be available if everyone involved chooses to pursue it voluntarily, a Washington court cannot compel anyone to undergo genetic testing while the child is still in the womb. If a dispute exists and one party will not cooperate, the court's power to order testing does not begin until after the child is born.

When Legal Parentage Actually Gets Established

Because the court's testing authority and the broader process of establishing legal parentage kick in around and after birth, most families find that the legal steps naturally follow delivery. Washington's Uniform Parentage Act, found in chapter 26.26A RCW, sets out the ways legal parentage is created and confirmed. One of the simplest is the acknowledgment of parentage. Under RCW 26.26A.200, the woman who gave birth and an alleged genetic father can sign an acknowledgment to establish the child's parentage, a step commonly handled at the hospital at or shortly after birth.

If parentage is contested rather than agreed upon, a parent, the child, or certain other parties can file a proceeding to adjudicate parentage under RCW 26.26A.400, and that is the context in which a court's genetic testing authority under RCW 26.26A.310 comes into play. Either path, the voluntary acknowledgment or the contested adjudication, generally operates once there is a born child whose legal parentage the law can formally recognize.

Why the Timing Matters for Your Family

For expectant parents, the practical takeaway is that private prenatal testing can answer a biological question early, but it does not by itself make anyone a legal parent. Legal parentage carries real consequences, including the right to be listed on the birth certificate, the ability to seek a parenting plan and residential time, child support obligations and rights, and the authority to make decisions for the child. Those consequences attach to legal parentage established under chapter 26.26A RCW, not to a prenatal lab result.

That distinction can matter a great deal in a place like Snohomish County, where growing families frequently include unmarried parents who want certainty about their rights before the baby arrives. Understanding early that the biological confirmation and the legal establishment are separate steps helps parents plan the right sequence: gather information now if you wish, then take the legal steps at or after birth to secure the parental rights that flow from them.

Getting the Sequence Right

If you are navigating pregnancy and questions about paternity at the same time, it helps to know both halves of the picture before you act. A physician or accredited testing laboratory can walk you through the medical side, and a family law attorney can explain how and when to establish legal parentage so your rights are protected once your child is born.

If you have questions about establishing parentage or protecting your rights as a parent in Snohomish County, the Law Office of Chad Foster is here to help you understand your options and plan your next steps.