If you've been researching pharmacogenetic testing, you've probably come across GeneSight. It's the most well-known pharmacogenetic test in the United States, often ordered through psychiatrists. But it's not the only option, and for many people it may not be the best fit. Whether GeneSight is too expensive, requires a doctor's order you can't get, or you simply want to compare options, here's what you should know about pharmacogenetic testing alternatives and what makes them different.
Pharmacogenetic testing provides information about how your body processes medications, but it is not a substitute for medical advice. Never start, stop, or change medications based solely on a genetic test result. Always discuss your results with your healthcare provider before making any medication changes.
GeneSight must be ordered by a healthcare provider, typically a psychiatrist. If you don't have easy access to a psychiatrist, or your provider isn't familiar with pharmacogenetics, this can be a significant barrier. Some alternatives, including Gene2Rx, allow you to use genetic data you already have from services like 23andMe or AncestryDNA, without needing a separate test or doctor's order.
GeneSight's list price is over $1,000, though insurance and patient assistance programs can reduce this. Out-of-pocket costs vary widely. If you already have 23andMe, AncestryDNA, or whole-genome sequencing data, you may be able to get pharmacogenetic insights at a fraction of the cost by using a service that analyzes your existing raw data.
GeneSight is designed for psychiatric medications: antidepressants, antipsychotics, mood stabilizers, and ADHD drugs. If you want pharmacogenetic information for a broader range of medications, including pain medications, cardiovascular drugs, statins, and acid reflux medications, you may need a more comprehensive report.
If you've already done a 23andMe, AncestryDNA, or whole-genome sequencing test, your raw genetic data likely contains the same gene variants that pharmacogenetic tests analyze. Services like Gene2Rx can extract pharmacogenetic insights from this data, meaning you don't need to provide a new DNA sample or pay for an entirely separate test.
All pharmacogenetic tests, regardless of brand, analyze the same core set of genes. Understanding what these genes do helps you evaluate any PGx service.
Metabolizes many antidepressants (paroxetine, venlafaxine, fluoxetine), ADHD medications (atomoxetine), pain medications (codeine, tramadol), tamoxifen, and beta-blockers (metoprolol). About 5-10% of Caucasians are poor metabolizers, and 1-2% are ultrarapid metabolizers.
Metabolizes SSRIs (sertraline, escitalopram, citalopram), clopidogrel (Plavix), proton pump inhibitors (omeprazole), and some antifungals. About 2-15% of people are poor metabolizers, and 5-30% are rapid or ultrarapid metabolizers, depending on ancestry.
Metabolizes warfarin, NSAIDs (ibuprofen, celecoxib), and some anticonvulsants. About 14% of people carry decreased-function variants.
Affects statin transport into the liver. About 15-20% of people carry variants that increase the risk of statin muscle pain, particularly with simvastatin.
The key question for any pharmacogenetic test is: does it analyze the genes relevant to your medications, and does it present the results in a way that's actionable? The underlying science is the same across providers. The differences are in which genes are covered, how results are reported, what medications are included, cost, and whether you need a provider order.
Pharmacogenetic testing is worth it if you've had difficulty finding the right medication (especially antidepressants, pain medications, or blood thinners), if you're starting a new medication with strong pharmacogenetic evidence (like clopidogrel after a heart stent), or if you simply want to have your pharmacogenetic profile on file for future prescribing decisions. It's a one-time test with lifelong results.
Learn how genetics may affect your response to these related medications:
Gene2Rx analyzes pharmacogenetic variants from genetic data you already have (23andMe, AncestryDNA, VCF files), covering over 100 medications across multiple drug classes including psychiatry, pain, cardiology, and more. GeneSight requires a provider order and a new cheek swab, and focuses primarily on psychiatric medications. Gene2Rx is typically much less expensive since it uses your existing data.
Yes. 23andMe's raw data files contain genotype information for many of the key pharmacogenetic variants in CYP2D6, CYP2C19, CYP2C9, SLCO1B1, and other genes. Services like Gene2Rx are specifically designed to extract and interpret these variants from raw data files.
The underlying science is the same. All reputable PGx services analyze the same core genes using established guidelines (like CPIC and FDA recommendations). The differences are in coverage breadth, report format, cost, and accessibility. The best test for you depends on your specific needs, what medications you're taking, and whether you already have genetic data available.
It depends on the service. GeneSight requires a healthcare provider order. Gene2Rx works directly with consumers using their existing genetic data. Regardless of how you get the test, sharing results with your doctor is essential for getting the most value from the information.
Find out how your DNA may influence your response to Sertraline and other medications with a Gene2Rx pharmacogenetics report.
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