Hair can be used for a DNA paternity or relationship test, but only some hair works. For a home tester, the part that matters most is the tiny root at the end, not the strand itself. Even then, hair is a backup sample: most labs would rather have a quick cheek swab, which is easier, cheaper, and almost always gives a result.1Health Street. Hair DNA Test: Hair Sample DNA Test Kit | Health Street2AlphaBiolabs. Can you do a paternity test with hair? People usually turn to hair because they can’t or don’t want to ask the other person for a swab, and that raises legal and court questions as well as lab ones.
Why the Hair Root Matters
The root (follicle) is the small, often pale bulb at the base of a pulled hair. It holds living cells with DNA.3AlphaBiolabs. Can you do a paternity test with hair? Consumer labs ask for hair with the root attached, because that’s what their standard methods can read.4My Forever DNA. Discreet DNA Testing | Alternative Samples Accepted5AlphaBiolabs. Can you do a paternity test with hair? Hair cut in a haircut generally has no root.6My Forever DNA. Discreet DNA Testing | Alternative Samples Accepted Hair from a hairbrush, or hair that fell out on its own, usually has no usable root either.7AlphaBiolabs. Can you do a paternity test with hair?
To check a hair, hold it against white paper in good light and look at the end that came from the scalp. A pulled hair often has a small whitish or translucent bulb, sometimes with a sheath around it. A clean, blunt end with no bulb usually means the hair was cut; a hair with a small dry club-shaped end and no sheath has likely been shed. A magnifying glass or the zoom on your phone camera makes the bulb easier to spot.
The strand itself isn’t empty. Rootless hair shafts still hold DNA, mostly in broken pieces.8PubMed Central. Fragmented Nuclear DNA Is the Predominant Genetic Material in Human Hair Shafts In older hairs those pieces are usually too short for the routine tests labs run.9PubMed Central. Fragmented Nuclear DNA Is the Predominant Genetic Material in Human Hair Shafts Specialist research labs can read rootless hair with advanced sequencing, but a standard paternity kit doesn’t offer that.10PubMed Central. Rootless hair as a reliable source of forensic genetic information
Hair that falls out naturally has usually finished growing and lost its living root cells. These hairs can look fine to the eye and still fail at the lab. Labs may still charge you for them, so send freshly pulled hair whenever possible.
How to Collect Hair for a DNA Test
Labs ask for at least 6 to 10 hairs with roots intact, and some say 7 to 10.11Health Street. Hair DNA Test: Hair Sample DNA Test Kit | Health Street12EasyDNA. Discreet Paternity Test | Discreet DNA Testing A single root holds far less DNA than a cheek swab, so extra hairs improve the odds.13AlphaBiolabs. Can you do a paternity test with hair? The scalp is the usual and least painful place to pull from, with eyebrows as a fallback.14ResearchGate. Collecting hair for DNA extraction and genetic studies, any tips? Eyebrow hair suits someone with very short, thin, or no scalp hair, though it hurts more and you should check that the lab accepts it. Don’t mix hairs from different places on the body in one envelope, because the lab needs to know what it is handling.
Pull hairs one at a time from as close to the scalp as possible, at a slight angle to the side rather than straight out.15ResearchGate. Collecting hair for DNA extraction and genetic studies, any tips? That makes it more likely the root comes out whole. Then you can trim the long end, leaving about 1 cm of hair above the root.16ResearchGate. Collecting hair for DNA extraction and genetic studies, any tips? Ship the hairs in a paper envelope, as labs instruct.17EasyDNA. Discreet Paternity Test | Discreet DNA Testing Storage and handling affect whether the lab can recover enough DNA,18My Forever DNA. Discreet DNA Testing | Alternative Samples Accepted so keep hairs dry, avoid plastic bags, and don’t touch the root end.
Wash and dry your hands, and have a clean paper envelope and label ready before you start. Check each hair for a root and set aside any without one. Fold the good hairs into clean paper, seal the envelope, and label it with the person’s name or the code the lab gives you.
Not every pulled hair brings its root. Pull more than the lab’s minimum, because some will turn out rootless and you want at least the required number with roots attached.
Mix-ups and contamination are the other risk. Collect each person’s hair separately and put each in its own envelope. Don’t collect two people’s samples on the same surface at the same time. Avoid handling roots with bare fingers, since your own skin cells can transfer. Note the date and where the hair came from in case the lab asks.
How Likely a Hair Test Is to Work
One home lab reports that DNA extraction from rooted hair works 80 to 90% of the time.19Health Street. Hair DNA Test: Hair Sample DNA Test Kit | Health Street Another lab lists success with rooted hair at 60% or less.20homeDNAdirect. Forensic DNA Testing | Hair DNA Test for Paternity | Forensic Samples | homeDNAdirect If the hair has no usable DNA, the lab can’t give a result at all.21Health Street. Hair DNA Test: Hair Sample DNA Test Kit | Health Street Cheek swabs, by contrast, almost always provide usable DNA.22Health Street. Hair DNA Test: Hair Sample DNA Test Kit | Health Street
A failed test means the lab couldn’t pull enough usable DNA from the roots. It doesn’t mean the two people are unrelated; you’re left with no answer rather than a wrong one. The usual next step is a new sample, ideally freshly pulled hairs or, if possible, a cheek swab, and the lab’s policy decides whether that costs extra.
Several things raise or lower your odds. More hairs with visible roots give the lab more cells to work with. Pairing the hair with a cheek swab from the other person keeps one side of the comparison reliable.
Before ordering, ask the lab a few things:
- What success rate they see with hair, since figures differ widely between labs.
- Whether they refund or retest if extraction fails.
- Whether they can try a second sample type if the hair doesn’t work.
- How many hairs they actually want, since requirements vary slightly.
Cost and How Hair Compares With a Cheek Swab
Hair testing costs more than a cheek-swab kit because extracting DNA from roots takes extra lab time and handling.23AlphaBiolabs. Can you do a paternity test with hair?24US Diagnostics Center. Collect Hair Roots That Actually Work for a Paternity Test in the U.S. Labs often add a separate processing fee for hair on top of the base test, for example about $80 at one lab.25homeDNAdirect. Forensic DNA Testing | Hair DNA Test for Paternity | Forensic Samples | homeDNAdirect26US Diagnostics Center. Collect Hair Roots That Actually Work for a Paternity Test in the U.S. So use a cheek swab for anyone who agrees to give one, and save hair for the person who can’t.
Labs often call a test using hair or other non-swab samples a discreet test. Usually one person sends hair while the other gives a cheek swab from a mailed kit. The lab compares the two profiles to see whether the people are related. Results take longer than swab-only tests because of the extra extraction step.
Some labs also accept items like toothbrushes or nails, which carry extra fees too. Like hair, these samples don’t always contain enough DNA, so ask which samples a lab accepts before collecting anything.
On a price page, look for the base test price and then a separate line for non-swab or hair samples, because the headline price often refers only to cheek swabs. Add the hair fee, any fee for extra people tested, and any rush charge to get your real total. Labs that look cheapest at first can end up costing the same after add-ons.
Using Shed or Cut Hair
Rootless hair still holds nuclear DNA, in fact most of the DNA in it, though in broken pieces.27PubMed Central. Fragmented Nuclear DNA Is the Predominant Genetic Material in Human Hair Shafts28ISHI News. No Nuclear DNA in Rootless Hair: Myth or Fact? – ISHI News Specialized sequencing has read genetic information from single rootless hairs in research settings.29PubMed Central. Rootless hair as a reliable source of forensic genetic information30PubMed Central. Rootless hair as a reliable source of forensic genetic information For a home relationship test, treat rootless hair as unusable and look for pulled hair instead.
Hair kept from a deceased relative is often cut or shed and lacks roots, so a standard home kit is unlikely to work. Specialist labs may attempt it at much higher cost.
Old hair is harder still. DNA in the strand breaks down further along the hair and with age. Hair kept in damp or soil conditions breaks down faster, partly because of fungi that feed on hair.31Archaeometry. Hair Degradation Patterns in Aquatic and Soil Environments Storing keepsake hair dry and cool helps preserve it, though a lab may still fail even with careful storage.
Will a Hair Test Count in Court
Because the hair is collected at home, results of home hair tests generally can’t be used in court.32Health Street. Hair DNA Test: Hair Sample DNA Test Kit | Health Street Courts expect a documented record showing who handled the sample from collection to result.33The Korean Academy of Scientific Criminal Investigation. Trust Requirements of Admissible Forensic Evidences; Focusing on Recent Precedents Requiring Chain of Custody Principle For a legal case, book a test where a neutral collector takes samples and checks IDs. No neutral person watched the hair being collected, so a court can’t tell whether it was swapped, taken from someone else, or tampered with, even when the lab’s work is accurate.
A legal test works differently. Each person attends an appointment or a collector visits. Identity is checked and photographed, and samples are sealed in front of witnesses. Paperwork follows the sample to the lab. These tests nearly always use cheek swabs, not hair.
A home test still makes sense for personal peace of mind before deciding on legal steps. Its result can be confirmed later with a legal test, but paying for both costs more, so decide first whether court is likely.
Is It Legal to Test Someone’s Hair Without Asking
In most US jurisdictions, collecting someone’s tissue to analyze their DNA without consent isn’t a crime or even a civil violation.34Boston University Law Review. DNA Theft: Recognizing the Crime of Nonconsensual Genetic Collection and Testing Some states and the federal government do restrict sharing genetic results in areas such as health and employment.35Boston University Law Review. DNA Theft: Recognizing the Crime of Nonconsensual Genetic Collection and Testing Secret testing also raises privacy concerns, both in taking the sample and in learning the person’s genetic information.36AMA Journal of Ethics. Shedding Privacy Along with our Genetic Material: What Constitutes Adequate Legal Protection against Surreptitious Genetic Testing? Check your local laws, and consider talking to the person or a family lawyer first.
Rules differ from state to state, and in many other countries consent for DNA testing is required by law. Some countries treat testing another person’s DNA without consent as a criminal offense, so a rule that applies at home may not apply if a sample or lab is overseas. Check the law where the person lives and where the lab is located before collecting anything.
Legal doesn’t mean risk-free. Even where collecting a hair isn’t a crime, it can damage trust and relationships, and in some cases family or custody disputes if it comes to light. The other person may see it as a serious breach whatever the law says.
A few questions are worth weighing first. How could the result affect a child, partner, or family if it comes out? Might the other person later agree to a swab instead? Will you need a legal test anyway, making a secret one redundant?