[Expert Explanation] Can't Hospitals Determine the Father of an Unborn Baby?

Rewritten on: December 25, 2025

This article explains in detail why hospitals do not perform prenatal parent-child DNA testing (NIPPT), the correct way to get tested at a specialized testing laboratory, the difference between private and legal testing, and the points to confirm before applying.

Why hospitals can't test, and key points for getting tested correctly

When you find yourself wondering "who is the father of the baby in my womb," the first question many people ask is "can a hospital test for this?"

The short answer is that hospitals do not perform prenatal parent-child testing (prenatal DNA paternity testing). This isn't unique to Japan — worldwide, prenatal paternity testing is regarded not as a medical procedure but as a test intended to confirm a "familial relationship," so it isn't something handled by a standard clinical department.[ref:1]

This article clearly explains the specific reasons hospitals cannot handle this testing, the procedures and precautions you should know if you want to be tested, and even the difference between private and legal testing — everything you need to know about prenatal DNA testing. If you're considering testing, please read to the end so you can make an informed and confident decision.

Why hospitals do not perform paternity testing

Tests performed at hospitals are primarily aimed at "diagnosis and treatment" — evaluating the health of the mother and fetus or checking for abnormalities during pregnancy. The ultrasounds and blood tests done at prenatal checkups are all classified as medical procedures aimed at protecting the safety of mother and child.

By contrast, prenatal parent-child testing is mainly intended to confirm who the biological father is or provide evidence for use in court or with public authorities. In other words, confirming a familial relationship is the primary purpose, which is fundamentally different in nature from care covered by health insurance. Medical procedures covered by health insurance are limited to "treatment or prevention of injury or illness," and confirming paternity does not fall within that scope.

There are several combined factors behind why hospitals do not perform prenatal paternity testing.[ref:1]

1. Legal risk
   Confirming a paternal relationship is an area extremely closely tied to legal disputes such as divorce proceedings, paternity acknowledgment claims, child support claims, and inheritance issues. If litigation were to arise over the test results, the hospital that performed the test could face significant liability. For a medical institution, bearing legal responsibility for an act outside its core clinical purpose represents a major risk.
2. Ethical concerns
   Prenatal paternity testing is often bound up with serious family issues, psychological stress, and in some cases even risks related to domestic violence (DV) — extremely sensitive circumstances. This is a different dimension of concern from the role that obstetric medical staff are meant to play, which is "protecting the health of mother and child," making it an area medical institutions are reluctant to actively engage with.[ref:6]
3. Medical accident and risk management considerations
   Sample collection for prenatal DNA testing is completed with nothing more than a blood draw from the mother, but this blood draw occupies the unusual position of not being for a "medical purpose." If an allergic reaction, infection, or other complication were to occur during the blood draw, responsibility for an act that isn't for medical purposes would become ambiguous, potentially developing into a serious problem for the hospital. For these risk-management reasons as well, hospitals must be cautious about offering prenatal parent-child testing as one of their own services.

Furthermore, in the materials on prenatal testing published by Japan's Ministry of Health, Labour and Welfare, prenatal genetic testing is discussed strictly in the context of medical purposes, and the performance of paternity testing is treated as outside the scope of the guidelines.[ref:1] This kind of institutional background is another reason hospitals do not perform paternity testing.

How to find out the father of an unborn baby

The most commonly used method today is Non-Invasive Prenatal Paternity Testing (NIPPT).[ref:2] This testing technology analyzes with high precision the fetal-derived cell-free DNA (cff DNA) present in the mother's blood, comparing it against the DNA of the alleged father to statistically evaluate the parent-child relationship.[ref:3]

Fetal-derived cell-free DNA is present in maternal blood from early pregnancy, and its concentration rises as the pregnancy progresses. NIPPT reads this cff DNA using cutting-edge analytical techniques such as next-generation sequencing (NGS) and cross-references it against the alleged father's genetic information. Through statistical methods, it is said to be possible to determine paternity with accuracy exceeding 99.99%.[ref:2]

Traditionally, determining paternity before birth required invasive procedures such as amniocentesis or chorionic villus sampling. Because these procedures require inserting a needle into the uterus, they carry a slight risk of miscarriage. NIPPT, on the other hand, is completed with nothing more than a blood draw from the mother, offering the groundbreaking advantage of an extremely low risk to the fetus.[ref:3]

However, in Japan, NIPPT is not approved as a medical test and is positioned strictly as a private service. As such, health insurance does not apply, and the full cost must be paid out of pocket. There are also restrictions on the gestational week at which testing can be performed, with 9 weeks of pregnancy or later generally recommended. Because the eligible gestational week varies by testing provider, it's important to confirm this in advance.

So where can you get tested?

Testing to determine the father of an unborn baby is performed at a specialized DNA testing laboratory.[ref:4] The reason a testing laboratory rather than a hospital handles this, as noted above, comes down to legal and ethical factors, but in addition, DNA parent-child testing requires specialized expertise different from medicine.

A reliable specialized testing laboratory has the following kind of framework in place.

• A dedicated team of DNA analysis specialists — staff with expertise in molecular biology and genetics handle everything from testing through to reporting results
• Assessment of test eligibility based on gestational week — the concentration of fetal-derived DNA varies with gestational week, so determining the right timing directly affects accuracy
• Evidence management for legal use (chain of custody) — a rigorous management system, from sample handoff through storage of analysis results, ensures the results hold up as legal evidence
• A testing environment compliant with international quality standards — analysis is performed in laboratories that meet international quality standards such as ISO certification and AABB accreditation [ref:4]
• Thorough protection of personal information — because genetic information is an extremely sensitive type of data, a high standard of information management, including certifications such as Japan's Privacy Mark, is required

The basic testing process

Prenatal DNA testing proceeds through the following steps. Many testing providers offer careful support at each step so that even first-time users can feel at ease.

1. Apply online or by phone — confirm the type of test (private/legal), gestational week, and other details, and choose the most suitable plan
2. Receive the kit — a testing kit is delivered to your home. The alleged father's sample (such as a cheek swab) can be collected using this kit
3. Blood draw (at a partner medical facility) → return the sample — the maternal blood draw is performed at a partner medical facility. After the draw, the sample is returned to the testing laboratory along with the kit
4. DNA analysis and result confirmation — DNA analysis is performed at the testing laboratory's specialized lab, and results are reported. Results are typically available around 5 to 10 business days after the sample arrives

For applications and further details, please check the official website of seeDNA Genetic Medicine Institute.

＼Find out who the father of your unborn baby is／

Why only the blood draw is done at a hospital

What prenatal DNA testing requires is maternal blood, and drawing blood is a medical procedure. Under Japanese law, drawing blood from a vein is defined as an act that only someone with a medical qualification, such as a doctor or nurse, may perform. For this reason, a DNA testing laboratory cannot perform the blood draw itself, and a partner medical institution is involved in the following way.

• The blood draw is performed at a partner medical institution contracted by the testing laboratory
• The medical institution performs only the blood draw, based on a blood collection order issued by the testing laboratory
• After the draw, the sample is placed in a dedicated cold storage container and returned to the testing laboratory

In other words, there is a clear division of roles: the testing itself cannot be performed at a hospital, but the blood draw is handled by the hospital as a medical procedure. The hospital is involved only in the medical procedure of "drawing blood" and has no involvement whatsoever in the DNA analysis or reporting of results. This arrangement minimizes legal risk for the hospital while ensuring the safety of the testing process.

Note that the dedicated tube used for the blood draw contains a special preservative solution that stably preserves the DNA in the blood. This ensures the DNA does not degrade between the blood draw and its arrival at the testing laboratory, allowing for highly accurate analysis.

The difference between private and legal testing

Prenatal DNA testing is broadly divided into two types: private testing (for personal confirmation) and legal testing (for court, mediation, or immigration submission).[ref:5] Which one you should choose depends on the purpose for which you intend to use the results.

Private testing is used when you want to confirm a parent-child relationship for your own peace of mind. It is not intended for submission to a court or government agency and is limited to personal confirmation. Legal testing, on the other hand, presupposes that the results will be submitted as evidence to a public authority such as a court, family court, or immigration bureau. As such, a third-party witness must be present during sample collection, and strict chain-of-custody (a continuous record of sample handling) is required.

Because it is difficult for hospitals to get involved in these complex legal procedures, a specialized DNA testing organization such as seeDNA Genetic Medicine Institute takes the lead in managing the process.

Below is a summary of the main differences between private and legal testing.

Comparing private and legal testing

• Purpose: private testing is for personal confirmation; legal testing is for use in legal proceedings such as court, mediation, or immigration
• Sample collection: private testing allows use of a mail-in kit; legal testing requires collection in the presence of a witness
• Blood draw: both are performed at a partner medical institution (legal testing may require a witness to be present)
• Witness: not required for private testing; required for legal testing (testing laboratory staff, an agency representative, a law office, or a traveling witness)
• Legal validity of the result: none for private testing; usable as official proof for legal testing
• Procedure: private testing is completed with an individual application; legal testing requires document preparation, identity verification, and more
• Hospital involvement: in both cases, limited to the blood draw only (hospitals cannot be involved in legal procedures)

If you choose legal testing, it is recommended to proceed in coordination with a legal professional such as a lawyer or judicial scrivener. seeDNA Genetic Medicine Institute has an established framework for coordinating with law offices, so those wishing legal testing can use the service with confidence.

＼Prenatal DNA testing that can also be used in court or mediation／

Points to confirm before applying

Testing providers differ in their framework, pricing, and partner institutions, so be sure to confirm the following points. In particular, when it comes to cost, the scope of services included in the testing fee can vary greatly between providers, so it's important not to judge based on the price list alone and to inquire about the details.

■ Pre-application checklist for prenatal DNA testing

• Type of test (private/legal) — choose the correct type according to your purpose
• Disclosure of testing accuracy and analysis method — confirm whether evidence for the technology and accuracy used is publicly available
• Gestational week requirements — the eligible gestational week for testing varies by provider
• What's included in the price — whether analysis fees, blood draw fees, shipping, and so on are included
• Additional fees (travel fees, witness fees, retesting fees, etc.) — important for avoiding unexpected costs
• Whether travel expenses are a "flat rate" or "actual cost" — this can make a large difference if you live far away
• Whether there is a partner medical institution near your home — confirm in advance whether you'll need to travel far for the blood draw
• Coordination with a law office for legal testing — whether legal procedures can proceed smoothly
• Personal and genetic information management practices — whether certifications such as the Privacy Mark or ISO are held
• Number of days until results / expedited service — check whether express service is available if you're in a hurry
• Cancellation, refund, and retesting policy — confirm the guarantees available in case something goes wrong

※ Many of these items are not always clearly stated on a provider's website, so it's important to confirm directly by email or phone before applying. Especially for legal testing, since procedural gaps can affect the legal validity of the results, prior consultation is strongly recommended.

In addition, the presence or absence of international accreditation or certification is an important indicator for judging a testing provider's reliability. Accreditation from the AABB (American Association of Blood Banks) proves that a relationship-testing laboratory meets international standards, and ISO 9001 is an international standard for quality management systems.[ref:4] Testing providers with these certifications are guaranteed a certain level of quality in their analysis accuracy and process management.

Summary

1. Prenatal DNA testing is not a medical procedure — it is a private service provided by specialized testing laboratories
2. Hospitals do not perform the test itself, but handle only the blood draw as a medical procedure
3. Because the procedures differ greatly between private and legal testing, choosing the option that matches your purpose is important
4. Cost, gestational week requirements, and additional fees vary by provider, so confirming in advance helps prevent trouble
5. When choosing a testing provider, international certification status and personal information protection practices are also worth checking

Prenatal parent-child testing is an extremely delicate topic, and many people considering it carry anxiety or uncertainty. That's exactly why making a decision based on accurate information matters most.

seeDNA Genetic Medicine Institute places the safety of the pregnant mother and baby first, and carefully explains testing content, procedures, and costs. We hold ISO 9001 international quality certification and the Privacy Mark for privacy protection, ensuring a system you can use with confidence. Please feel free to reach out with any concerns.

Frequently Asked Questions

Q1. Why can't I get a prenatal DNA paternity test at a hospital?

A. Prenatal DNA paternity testing is aimed at "confirming a familial relationship," which differs from the medical procedures aimed at "diagnosis and treatment" that protect the health of the mother and fetus. For a combination of reasons — legal risk, ethical concerns, and medical accident risk management — medical institutions do not offer this service. Testing can be done at a specialized DNA testing laboratory.

Q2. From when can I get a prenatal DNA test (NIPPT)?

A. Testing is generally possible from 9 weeks of pregnancy onward. However, since the eligible gestational week can vary by testing provider, be sure to confirm before applying. Because the concentration of fetal-derived cell-free DNA rises as pregnancy progresses, being tested at the right time improves accuracy.

Q3. Is there any danger to the baby from prenatal DNA testing?

A. Because NIPPT (non-invasive prenatal paternity testing) is completed with nothing more than a blood draw from the mother, the risk to the fetus is considered extremely low. Unlike traditional amniocentesis or chorionic villus sampling, which require inserting a needle into the uterus, there is no risk of miscarriage. The burden on the mother is also comparable to an ordinary blood draw.

Q4. Should I choose private testing or legal testing?

A. Choose based on the intended use of the results. If your purpose is purely personal confirmation, private testing is sufficient. On the other hand, if you need proof for a public authority — such as submission to a court, a paternity acknowledgment claim, or submission to an immigration bureau — you should choose legal testing. Since legal testing requires a witness to be present and submission of identity verification documents, it's recommended to consult with the testing provider in advance.

Q5. How accurate is prenatal DNA testing?

A. The latest NIPPT technology is said to determine paternity with accuracy exceeding 99.99%. By using next-generation sequencing (NGS) technology to analyze fetal-derived DNA in maternal blood and statistically compare it against the alleged father's DNA, high reliability is achieved. However, since the technology used and the accuracy achieved vary by testing provider, it's important to confirm in advance whether evidence is publicly disclosed.

Q6. Where can I get the blood draw done? Can I use my regular doctor's clinic?

A. The blood draw is basically performed at a partner medical institution affiliated with the testing laboratory. Whether your regular OB-GYN or a general hospital can accommodate this depends on the testing laboratory's partnership arrangements. Check with the testing laboratory before applying to confirm whether there is a partner medical institution near your home.

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