Clinical Genomics and 23andMe Are Not the Same Test

There is a spit tube on your counter that you bought two Christmases ago. There is a folder of raw data you uploaded to a site that came back saying your child has 14 things wrong with him. And now someone has mentioned clinical genomics, and you are trying to work out whether you already did this.

You didn't. They are not the same test. Here is the difference, laid out plainly.

What do parents ask me most about this?

Short answers first. The full reasoning is below.

Is 23andMe the same thing as a clinical genetic test?

No. A consumer ancestry and health kit is not a clinical genetic test. Consumer kits mostly use a genotyping chip, which checks a fixed list of preselected spots in the genome.

What is IntellxxDNA, and what does it look at?

IntellxxDNA is a clinical decision support panel run from a cheek swab. It looks at pathways rather than at diagnoses: inflammation, detoxification, methylation, nutrient processing, anxiety and depression tendencies, and autism-related biology.

What is GeneDx, and what does it look at?

GeneDx is a clinical diagnostic laboratory. Its testing is also a cheek swab, and it is often covered by insurance.

Which test does what?

Each of the three tests answers a different question. A consumer kit answers questions about ancestry and a short list of preselected traits and risks.

Why can't I just upload my raw data to a third-party site?

You can upload it. The problem is what comes back. When a clinical laboratory reviewed 49 samples sent in to confirm variants found in consumer raw data, 40% of those variants turned out to…

What does folate have to do with genetics?

Folate is the clearest example of why pathway information is useful. Folate does not drift into the brain on its own.

Do these results tell you what medication my child should take?

No. These results do not tell me what medication your child should take, and I do not prescribe your child's psychiatric or neurologic medications.

Are these findings a diagnosis?

No. These genetic findings are not diagnoses — they simply identify areas where his body benefits from additional support throughout his life.

Is 23andMe the same thing as a clinical genetic test?

No. A consumer ancestry and health kit is not a clinical genetic test. Consumer kits mostly use a genotyping chip, which checks a fixed list of preselected spots in the genome. Clinical sequencing reads the letters themselves across the genes it covers. Those are different technologies answering different questions, and they are not interchangeable.

The gap is measurable. Researchers compared chip data with sequencing data in nearly 50,000 people. On common variants the chips did beautifully. Across more than 100,000 common spots, they were right well over 99% of the time.1 For very rare variants, the ones a health decision would actually hang on, only 16% of the chip results held up against sequencing.1

You did not do anything wrong by buying the kit. It answers the question it was built for. It was simply never built for the question you are asking now.

What is IntellxxDNA, and what does it look at?

IntellxxDNA is a clinical decision support panel run from a cheek swab. It looks at pathways rather than at diagnoses: inflammation, detoxification, methylation, nutrient processing, anxiety and depression tendencies, and autism-related biology. I order it, I interpret it, and it exists to tell me where a child's body may need extra support.

IntellxxDNA does not diagnose anything. It does not find the cause of a syndrome. What it does is give me a reason to look harder at one pathway in one child. That is a different job from the one clinical sequencing does.

In practice, the children I see who benefit most from it are the ones where the picture is mixed and nothing has fit cleanly. It gives me somewhere specific to aim instead of a long list of general recommendations.

What is GeneDx, and what does it look at?

GeneDx is a clinical diagnostic laboratory. Its testing is also a cheek swab, and it is often covered by insurance. GeneDx is looking for a molecular diagnosis: an actual identified genetic condition that explains a child's development, seizures, features or medical history. That is a different question from the one IntellxxDNA answers.

The numbers show how different. In 3,040 consecutive clinical exome cases at that laboratory, an overall diagnosis was reached in 28.8% of children.2 When only the child was tested, the yield was 23.6%. When three family members were analyzed together, it rose to 31.0%.2 That is why trio testing, where both parents are sequenced alongside the child, is worth the extra swabs.

For questions about development, this is the mainstream position and not a fringe one. A consensus statement pooled 30 studies. Sequencing found a diagnosis in 36% of children with neurodevelopmental disorders. The older first-line test found one in 15% to 20%. The panel recommended sequencing go first.3

Which test does what?

Each of the three tests answers a different question. A consumer kit answers questions about ancestry and a short list of preselected traits and risks. IntellxxDNA points at pathways that may need support. GeneDx looks for a diagnosis. Buying one does not give you the other two.

What it is for

A consumer ancestry and health kit: Ancestry, relatives, and a short fixed list of trait and risk reports

IntellxxDNA: Clinical decision support. Which pathways in this child may need extra support

GeneDx: Clinical diagnosis. Is there an identified genetic condition behind this picture

How it reads the DNA

A consumer ancestry and health kit: A genotyping chip that checks a preselected list of spots

IntellxxDNA: A curated set of variants chosen for pathway relevance, reported with clinical context

GeneDx: Sequencing, which reads the letters across the genes covered

What it can tell you

A consumer ancestry and health kit: Ancestry, carrier and trait information, and a limited set of authorized health reports

IntellxxDNA: Where a child's biology tends to run tight, so support can be aimed rather than guessed at

GeneDx: A named molecular diagnosis in roughly 29% of children tested, and about 31% when three family members are analyzed

What it cannot tell you

A consumer ancestry and health kit: Anything reliable about rare variants. Only 16% of very rare chip results held up against sequencing

IntellxxDNA: A diagnosis. It is not looking for one and it will not find one

GeneDx: What to do about pathways and nutrient handling. That is not what a diagnostic test reports

Who orders it

A consumer ancestry and health kit: You do. No clinician is involved at any point

IntellxxDNA: A clinician trained on the platform. In my practice, that is me

GeneDx: A clinician. I order it, and so do geneticists, neurologists and developmental pediatricians

How it gets paid for

A consumer ancestry and health kit: Out of pocket, usually under a hundred dollars

IntellxxDNA: Out of pocket. Happy Kid Functional Medicine is a self-pay practice

GeneDx: Often covered by insurance

The sample

A consumer ancestry and health kit: Saliva at home

IntellxxDNA: Cheek swab

GeneDx: Cheek swab, ideally from the child and both parents

Why can't I just upload my raw data to a third-party site?

You can upload it. The problem is what comes back. When a clinical laboratory reviewed 49 samples sent in to confirm variants found in consumer raw data, 40% of those variants turned out to be false positives.4 Two out of five were not real.

It gets worse than that. Some variants labeled "increased risk" in the raw data or by a third-party service were classified as benign by multiple clinical laboratories, and are common in the general population.4

The rare-variant problem is worse than most people realize. The same large study looked at 21 people who bought consumer tests and shared their data publicly. Twenty of the 21 carried at least one rare harmful variant that was called wrongly.1 For two well-known cancer risk genes, the chips had a positive predictive value of 4.2%.1

Third-party interpretation services also sit in a genuine regulatory gap. A 2020 analysis of four US agencies concluded that federal oversight of these services is limited and unsettled.5 So the frightening report you were handed at 11 p.m. was generated by a service that nobody is checking, from data that was never meant to answer that question.

If you already have a scary raw-data report, bring it. I will read it with you. I will not act on it without proper confirmation, and I will tell you honestly which lines on it are worth a second thought and which are noise.

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What does folate have to do with genetics?

Folate is the clearest example of why pathway information is useful. Folate does not drift into the brain on its own. It is carried across a barrier by a receptor at the choroid plexus, then packaged and shuttled into brain tissue.6 That is a transport step, and transport can run well in one child and poorly in another.

There is a condition that shows this dramatically. In children with cerebral folate deficiency, folate levels in the blood are normal while folate in the spinal fluid is low. Researchers found blocking autoantibodies against the folate receptor in 25 of 28 affected children, and in 0 of 28 healthy controls.7 The folate was there. The doorway was blocked.

This is why I sometimes order folate receptor autoantibodies, which is an antibody test and not a genetic test at all. And it is why I prefer active forms of folate and B vitamins over synthetic folic acid in the children I see. Different forms take different routes, and the route matters when transport is the tight step.

Do these results tell you what medication my child should take?

No. These results do not tell me what medication your child should take, and I do not prescribe your child's psychiatric or neurologic medications. Where genetics truly does inform prescribing, the guidance comes from formal published guidelines that grade their own evidence in levels. Those decisions belong to the prescriber.8

I say this plainly because "your genes say this drug won't work" is one of the most oversold claims in this field. The real guidelines are careful. They cover specific drug pairings, and they are far narrower than the marketing suggests.

Never stop or change a prescribed medication because of a genetic report. Antipsychotics in particular are never stopped abruptly. Bring the report to the prescriber and let them decide.

Are these findings a diagnosis?

No. These genetic findings are not diagnoses — they simply identify areas where his body benefits from additional support throughout his life. That sentence is the one I want you to keep, because it is the piece that gets lost between the report and the kitchen table.

A pathway finding is not a prediction and it is not a verdict. It is a note about where a body tends to run tight. It does not mean something is wrong with your child, and it does not mean he is fragile. It means we know where to aim.

A diagnosis from clinical sequencing is a different kind of information, and it can be genuinely load-bearing. It can change what specialists a child sees, what gets monitored, and what other families in your family need to know. It is worth pursuing when the picture calls for it.

Which one would I start with?

I would start with whichever one matches your actual question. If the question is whether there is an identified condition behind your child's development or medical history, that is clinical sequencing through GeneDx, and insurance often covers it. If the question is where to aim support in a child who has already been worked up, that is IntellxxDNA.

And often the honest answer is neither, not yet. Genetics does not move first in most of the children I see. Basic nutrient status, iron studies, vitamin D, thyroid and gut work usually tell me more, faster, for less money. This isn't about doing more. It's about doing less, more intentionally, in the order his body needs.

If you want the fuller picture of how I use genetics in a plan, pediatric genomic testing lays it out. For how I order a whole workup, what a natural pediatrician does walks through the method. And pediatric gut and microbiome testing covers the piece that usually comes first.

You are not behind. You bought a kit because you were trying to find an answer for your child, which is the same reason you are reading this at whatever hour it is. That instinct was right. It just needed a better tool, and now you know which one asks your question.

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Written by Dr. Amy Patton, Founder Happy Kid Functional Medicine

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About the author

This article was written by Dr. Amy Patton, DNP, APRN, CPNP-PC, FMACP, a board-certified pediatric nurse practitioner and functional medicine provider serving Omaha-area families through Happy Kid Functional Medicine. Dr. Patton specializes in root-cause pediatric care for children's gut health, sleep, behavior, nutrition, immune patterns, and whole-child wellness. She sees patients in person in Omaha and by telehealth across Arizona, Colorado, Iowa, Nebraska, Tennessee, and Virginia.

References

1. Weedon MN, Jackson L, Harrison JW, Ruth KS, Tyrrell J, Hattersley AT, Wright CF. Use of SNP chips to detect rare pathogenic variants: retrospective, population based diagnostic evaluation. BMJ. 2021;372:n214. PubMed

2. Retterer K, Juusola J, Cho MT, Vitazka P, Millan F, Gibellini F, Vertino-Bell A, Smaoui N, Neidich J, Monaghan KG, McKnight D, Bai R, Suchy S, Friedman B, Tahiliani J, Pineda-Alvarez D, Richard G, Brandt T, Haverfield E, Chung WK, Bale S. Clinical application of whole-exome sequencing across clinical indications. Genetics in Medicine. 2016;18(7):696–704. PubMed

3. Srivastava S, Love-Nichols JA, Dies KA, Ledbetter DH, Martin CL, Chung WK, Firth HV, Frazier T, Hansen RL, Prock L, Brunner H, Hoang N, Scherer SW, Sahin M, Miller DT. Meta-analysis and multidisciplinary consensus statement: exome sequencing is a first-tier clinical diagnostic test for individuals with neurodevelopmental disorders. Genetics in Medicine. 2019;21(11):2413–2421. PubMed

4. Tandy-Connor S, Guiltinan J, Krempely K, LaDuca H, Reineke P, Gutierrez S, Gray P, Tippin Davis B. False-positive results released by direct-to-consumer genetic tests highlight the importance of clinical confirmation testing for appropriate patient care. Genetics in Medicine. 2018;20(12):1515–1521. PubMed

5. Guerrini CJ, Wagner JK, Nelson SC, Javitt GH, McGuire AL. Who's on third? Regulation of third-party genetic interpretation services. Genetics in Medicine. 2020;22(1):4–11. PubMed

6. Grapp M, Wrede A, Schweizer M, Hüwel S, Galla HJ, Snaidero N, Simons M, Bückers J, Low PS, Urlaub H, Gärtner J, Steinfeld R. Choroid plexus transcytosis and exosome shuttling deliver folate into brain parenchyma. Nature Communications. 2013;4:2123. PubMed

7. Ramaekers VT, Rothenberg SP, Sequeira JM, Opladen T, Blau N, Quadros EV, Selhub J. Autoantibodies to folate receptors in the cerebral folate deficiency syndrome. New England Journal of Medicine. 2005;352(19):1985–1991. PubMed

8. Caudle KE, Klein TE, Hoffman JM, Muller DJ, Whirl-Carrillo M, Gong L, McDonagh EM, Sangkuhl K, Thorn CF, Schwab M, Agundez JA, Freimuth RR, Huser V, Lee MT, Iwuchukwu OF, Crews KR, Scott SA, Wadelius M, Swen JJ, Tyndale RF, et al. Incorporation of pharmacogenomics into routine clinical practice: the Clinical Pharmacogenetics Implementation Consortium (CPIC) guideline development process. Current Drug Metabolism. 2014;15(2):209–217. PubMed

Medical disclaimer: This article is educational and is not medical advice. It does not diagnose, treat, or replace individualized care from your child's pediatrician or licensed medical provider. Supplement types, doses, and combinations should be selected with a qualified clinician who knows your child's full history — never start a new supplement based on a blog post alone. Always consult your pediatrician before making changes to your child's routine, and seek prompt medical care for snoring with gasping or pauses in breathing during sleep, or for any severe, sudden, or concerning symptom. These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease.