A court-ordered paternity DNA test is granted when a party files a sworn motion in family court showing a reasonable possibility that a man is or is not a child’s biological father, and the judge then orders everyone involved to give samples at an accredited laboratory. The results carry binding legal weight for child support, custody, inheritance, and government benefits. Federal law requires every state to make this process available in contested cases, and the Uniform Parentage Act supplies the procedural framework most courts work from.
Who Can Ask a Court to Order the Test
In any contested paternity case, federal law requires states to compel genetic testing when the request is backed by a sworn statement either alleging or denying paternity. The statement has to lay out facts showing a reasonable possibility that the alleged father is or is not the biological parent. The bar is low enough for legitimate disputes to proceed and high enough to screen out baseless requests.
The people who typically have standing to ask are the mother, the man alleged to be the father, and the child acting through a legal guardian or representative. State child support agencies can also order testing when they are pursuing support for a child receiving public assistance, though agency-initiated testing generally cannot proceed if the child already has a presumed, acknowledged, or adjudicated parent other than the birth mother.
Deadlines That Can Block a Test Before You Even File
Timing matters more than most people realize, and in some situations a court will refuse to order DNA testing at all.
When a child is born to a married couple, the law in every state presumes the husband is the father. Under the Uniform Parentage Act, that presumption generally cannot be overcome after the child turns two years old, unless the presumed parent is not the genetic parent, never lived with the child, and never held the child out as their own. A man who has been raising a child as his own for several years can find that courts simply will not order testing, no matter what he suspects. The reasoning is that once enough time has passed, courts prioritize the child’s established family bonds over biological truth. State cutoffs sometimes differ from the UPA model, so the local deadline is worth checking.
A proceeding to determine whether a presumed parent or alleged genetic parent is actually the child’s parent can be brought at any time before the child reaches adulthood. After that, only the child can start it.
A separate deadline governs voluntary acknowledgments of paternity, the forms many fathers sign at the hospital. A signed acknowledgment carries the same weight as a court judgment. Either parent can rescind within 60 days of signing, or sooner if a court or administrative proceeding involving the child begins before those 60 days expire. After that window, the only way to challenge the acknowledgment is to go to court and prove fraud, duress, or a material mistake of fact, and the burden falls on whoever brings the challenge. Child support obligations stay in effect during the proceeding unless a judge finds good cause to suspend them. DNA results are usually what a challenger needs to show material mistake of fact, but the longer the wait, the more weight courts give to the child’s reliance on the established relationship.
Filing the Motion for Genetic Testing
The process starts with a formal motion or petition in the family court for the county where the child lives. The paperwork goes by different names in different jurisdictions, but it functions the same way. You identify the mother, the child, and the alleged father by full legal name, date of birth, and current address so the court can reach everyone.
A supporting affidavit or sworn declaration goes with the motion. If you are alleging paternity, describe the circumstances that support a reasonable possibility of a biological relationship. If you are denying it, explain why you believe you are not the biological father. The statement is signed under oath, which in most jurisdictions means signing before a notary. Notary fees for this kind of document are modest, with most states capping them between $2 and $25 per signature.
Filing triggers a court fee that varies by jurisdiction and typically runs a few hundred dollars for a paternity petition. If you cannot afford it, you can request a waiver by submitting financial disclosure forms showing income and expenses. Courts routinely grant waivers for low-income filers.
Service, the Hearing, and What Happens If Someone Refuses
After filing, you have to make sure the other party gets formal notice of the proceeding. Service of process typically involves a professional process server or sheriff’s deputy physically delivering the papers to the respondent. Service fees generally run between $40 and $150. Botching this step can derail the case, because a court cannot issue binding orders against someone who was never properly notified.
Once the respondent is served, they get a set period to respond. After that window closes, the court schedules a hearing. If the judge finds the motion properly supported, the court signs an order requiring all parties to appear at an approved laboratory for sample collection. The order sets deadlines and names the facility.
Refusing to comply has real consequences. Under the Uniform Parentage Act, an order for genetic testing is enforceable by contempt, which can mean fines or jail at the judge’s discretion. More practically, if an alleged parent will not submit to testing, the court can adjudicate that person as the child’s parent based on the available evidence. Refusing the test does not make the case go away. It usually makes the result worse for whoever refused.
What the Test Costs and Who Pays
Legal DNA testing at an accredited laboratory typically costs between $300 and $500 for a standard three-person test covering mother, child, and alleged father. When a state child support agency orders the testing, federal law requires the agency to cover the cost upfront. The state can then recoup those fees from the father if paternity is established.
In privately filed cases, the court decides how to split the cost. Some judges require the petitioner to pay first and shift the expense to the other party if the results support the petitioner’s position. Others split costs evenly from the start. Many jurisdictions allow the testing expense to be recovered as part of the final order when the results confirm the petitioner was right.
Why the Lab and Chain of Custody Matter
For DNA results to hold up in court, the testing has to be performed at a laboratory accredited by the AABB (formerly the American Association of Blood Banks) or an accrediting body designated by the U.S. Department of Health and Human Services. Both federal law and the Uniform Parentage Act impose this requirement, and many state laws specifically mandate AABB accreditation. Reports from unaccredited facilities will not be accepted by most courts or immigration offices.
Accreditation alone is not enough. Samples have to travel from collection to analysis under a documented chain of custody. A neutral third-party collector with no stake in the outcome verifies each participant’s identity using government-issued photo ID and often photographs the participants at collection. The collector seals each sample in tamper-evident packaging and handles transport directly to the lab.
This is the critical difference between a legal test and an at-home DNA kit. At-home kits let you swab cheeks in your living room and mail samples in, which is fine for personal curiosity. But because nobody verified who actually provided the samples, the results carry zero weight in court. For anything affecting child support, custody, or inheritance, only a chain-of-custody test at an approved facility will work.
What the Results Mean Legally
Modern paternity tests compare genetic markers between child and alleged father and calculate a probability of paternity. When the alleged father is not excluded, most states treat a probability of 99% or higher as creating a rebuttable presumption that he is the biological father. Some states set the bar at 99.9% with a combined parentage index of at least 1,000 to 1. Current testing technology routinely produces probabilities above 99.99% when the tested man is in fact the biological father.
Once the presumption kicks in, the burden shifts. The alleged father can only rebut it by producing his own genetic testing that either excludes him or identifies another man as the father. Arguing that the test might be wrong, without counter-evidence, will not overcome the presumption.
Federal law reinforces the weight of these results by requiring states to admit accredited genetic test reports as evidence of paternity without expert testimony or additional proof of accuracy, unless a written objection is filed before the hearing. If no one objects in time, the lab report essentially speaks for itself. Any objection has to be filed in writing a specified number of days before the hearing where the results will be introduced.
What Changes Once Paternity Is Established
A court determination of paternity creates a legal relationship that triggers specific rights and obligations on both sides.
Child Support
Established paternity is the legal prerequisite for a child support order when parents are unmarried. No support order can be entered until paternity exists. Once it does, the court sets support using state guidelines that factor in both parents’ income, the child’s needs, and the custody arrangement. Obligations typically run until the child turns 18, though some states extend them through college or where the child has a disability.
Custody and Visitation
A father who establishes paternity gains the legal right to seek custody or visitation. Without established paternity, an unmarried biological father has no enforceable right to a relationship with the child regardless of how involved he has been. A court entering a support order may address custody, visitation, and other parental rights at the same time.
Inheritance and Government Benefits
A child with legally established paternity can inherit from the father through intestate succession, meaning the child has inheritance rights even if the father dies without a will. The child also becomes eligible for the father’s medical and life insurance benefits, Social Security survivor or disability benefits, and potentially veterans’ benefits. Establishing paternity after a father’s death is possible for Social Security purposes but often requires meeting the state’s intestacy standard, which can demand clear and convincing evidence rather than the simpler preponderance standard used in most paternity proceedings.
Medical History
An established parent-child relationship also gives the child access to the father’s family medical history. Doctors rely on that information for screening and preventive care, and it can be consequential for the child’s long-term health.