What a post mortem DNA test answers

A post mortem (or "postmortem") test directly analyzes the DNA of a deceased individual, then compares it to another participant (usually a child claiming to be their biological descendant). It's used to confirm or rule out paternity, maternity, sibling, or other family relationships when the central person has passed away.

When you'd need a post mortem test

The most common situations:

  • Inheritance and probate disputes. A child needs to prove biological connection to a deceased parent to claim inheritance, especially in cases without a will or with contested wills.
  • Birth certificate changes. Adding a deceased father's name to a child's birth certificate often requires DNA evidence.
  • Social Security survivor benefits. Children may need to prove biological relationship to claim a deceased parent's benefits.
  • Veterans benefits and military pensions. The VA may require DNA evidence for dependent claims after the service member's passing.
  • Wrongful death claims. Establishing legal heirs in wrongful death lawsuits.
  • Immigration cases. USCIS may accept post mortem DNA evidence in family reunification petitions where a U.S. citizen parent has passed.
  • Closure for the family. Some families simply want to know, especially when paternity was contested during the person's lifetime.

Where the DNA sample comes from

The lab needs a sample containing the deceased person's DNA. The viable sources, in rough order of preference:

1. Pre-existing medical samples

If the person had any medical procedure that involved DNA collection (a blood test, tissue biopsy, surgical sample), some hospitals and labs retain preserved samples for years. These are the cleanest source.

2. Funeral home or coroner samples

If the person passed away recently, the funeral home or coroner may still have blood or tissue samples that can be tested. Time matters here. Many funeral homes destroy or release such samples within weeks of a service.

If you're considering this test and the person passed recently, contact us as soon as possible. We can sometimes coordinate directly with the funeral home or coroner to preserve a sample before it's no longer available.

3. Personal items with biological material

If no preserved medical sample exists, certain personal items can yield testable DNA:

  • Hair from a comb or brush (must include the root, not just the hair shaft)
  • Toothbrush (recently used)
  • Razor with skin cells
  • Worn clothing with sweat (less reliable)
  • Eyeglasses or earrings (skin contact)
  • Fingernail clippings

These sources are less reliable than medical samples because they can be contaminated or degraded. The lab may not be able to extract enough DNA. There's no guarantee a usable sample can be obtained.

4. Exhumation

In legally important cases (especially inheritance disputes), a court can order exhumation of the body for DNA sampling. This is invasive, expensive, requires court orders, and is rarely the first option. But it's available when no other source exists and the stakes justify it.

When direct testing isn't possible

If no usable sample of the deceased exists, you don't necessarily lose the ability to confirm a biological relationship. The alternatives are:

  • Grandparentage test: use the deceased's parents (the child's grandparents) if they're alive
  • Avuncular test: use the deceased's siblings (the child's aunts/uncles)
  • Siblingship test: use the deceased's other known children (the child's half-siblings or full siblings)

Each of these has different accuracy levels and uses, covered in separate articles in this Help Center.

Time sensitivity

Post mortem testing is the most time-sensitive type of DNA test. The longer you wait after the person's passing, the harder it becomes:

  • First weeks: Funeral home or coroner samples are often still available. Personal items have the freshest biological material.
  • First months: Hospital samples may still be on file. Personal items may be cleaned or discarded.
  • First years: Mostly limited to preserved medical samples or exhumation.
  • After many years: Direct sampling often isn't possible. Alternative testing (grandparentage, avuncular, siblingship) becomes the only path.

Legal and emotional considerations

Post mortem tests often happen in emotionally difficult contexts. Common challenges:

  • Family objections. Surviving relatives may object to testing a deceased person's DNA. Legally, the next of kin typically controls access to personal items and biological samples.
  • Permission requirements. Hospitals, coroners, and funeral homes typically require legal authority (next of kin status or a court order) to release biological samples.
  • Inheritance timing. Many estates have strict deadlines for claims. If you're considering a post mortem test for inheritance reasons, contact a probate attorney quickly.

Legal vs. peace of mind

Post mortem tests are almost always legal (chain-of-custody) tests, since the typical purpose is court, government, or legal proceedings. Chain of custody requires:

  • Documented authority to obtain the sample (next of kin, court order, or hospital/coroner release)
  • Sealed, witnessed sample collection
  • Tamper-evident handling through to the lab
Key Takeaway

A post mortem DNA test can still answer biological questions after someone has passed, but time matters. If you're considering one, the sooner you start, the more options you have. Even if direct sampling isn't possible, relatives of the deceased can sometimes provide a defensible answer through grandparentage, avuncular, or siblingship testing.