Quick answer: Genetic testing analyzes your DNA to identify variations that may affect your health, disease risk, or medication response. The main types include diagnostic, predictive, pharmacogenomic, and methylation testing. Results are most valuable when interpreted by a clinician who can translate genetic signals into a personalized health plan.

Most people know their blood type. Fewer know what their genes are actually saying about their long-term health.

Genetic testing has evolved far beyond ancestry kits and paternity tests. Today, it sits at the frontier of personalized medicine, offering a window into how your body processes medication, where your chronic disease risk lies, and even how well your cells are aging at the molecular level. For families navigating complex health histories, or individuals who’ve felt dismissed by conventional diagnostics, genetic testing can be the difference between guessing and knowing.

At hol+, we believe that understanding your biology is one of the most empowering things you can do for your health. This guide breaks down what genetic testing is, the different types available, what the results actually mean, and how to use that information as part of a whole person health strategy. Whether you’re exploring testing for the first time or trying to make sense of results you’ve already received, genetic testing may be the foundation you need.

To get started with genetic testing, or for guidance interpreting your results, schedule a free, 15-minute consultation>>

What Is Genetic Testing, and How Does It Work?

Genetic testing examines your DNA – the molecular instruction manual encoded in nearly every cell of your body. By analyzing specific segments of your genetic code, clinicians can identify variations, mutations, or patterns that influence how your body functions, how it responds to certain substances, and where vulnerabilities may exist.

The testing process itself is straightforward. Depending on the type of test, a sample is collected from your saliva, blood, or cheek swab. That sample is then processed in a laboratory, where your DNA is sequenced or analyzed for specific markers. Results are returned – usually within days to a few weeks – and reviewed by a clinician trained to interpret their significance.

What makes modern genetic testing so useful is not just the data it generates, but the context a skilled practitioner brings to it. Raw genetic results are signals, and without proper interpretation, the results can sometimes be useless, or – at worst – actually cause more harm than good (1). 

The goal of doctor-led holistic care is to translate those signals into actionable, meaningful guidance tailored to your individual biology.

Read: Are You Getting the Right Functional Medicine Tests?

The Main Types of Genetic Testing and What Each One Reveals

Not all genetic tests are designed to answer the same question. Here’s how to choose the right test for your specific health goals.

Diagnostic Genetic Testing

Diagnostic testing is used when a genetic condition is already suspected due to symptoms, family history, or a clinical finding. It confirms or rules out a specific inherited disorder, such as cystic fibrosis, Huntington’s disease, or hereditary hemochromatosis (2).

This type of testing is typically ordered by a physician or genetic counselor when there’s a clinical reason to investigate. The results can clarify a diagnosis, guide treatment decisions, and inform family members about their own risk.

Predictive and Presymptomatic Genetic Testing

Predictive testingidentifies gene variants associated with conditions that haven’t yet developed, giving you the opportunity to take preventive action before symptoms appear.

Genetic testing for cancer is one of the most well-known applications of this approach. Variants in the BRCA1 and BRCA2 genes, for example, are associated with a significantly elevated risk of breast and ovarian cancer. According to the National Cancer Institute, women with a BRCA1 mutation have a 55-72% lifetime risk of developing breast cancer, compared to about 12% in the general population (3). Genetic testing for breast cancer and other hereditary cancers allows individuals and their care teams to develop targeted surveillance and prevention strategies well before a diagnosis becomes necessary.

Predictive testing is most meaningful when paired with genetic counseling and a root cause medicine approach. This means we ask not just “what is the risk?” but “what can we do about it?“

Related: Hidden Triggers of Autoimmune Disease, Explained

Pharmacogenomic (PGx) Testing

Pharmacogenomic testing – sometimes called genetic testing for medication – examines how your genes influence your response to drugs. It’s one of the most clinically actionable forms of genetic testing available today.

Your liver contains enzymes that metabolize most medications. Genes like CYP2D6, CYP2C19, and CYP3A4 encode those enzymes, and genetic variations in these pathways mean that some people metabolize certain drugs too quickly (making them ineffective), while others metabolize them too slowly (increasing the risk of side effects or toxicity) (4). According to the FDA, more than 200 drug labels currently include pharmacogenomic information (5).

This type of testing is particularly valuable for psychiatric medications, blood thinners, pain management drugs, and chemotherapy agents – areas where finding the right dose or drug can otherwise take months of trial and error.

Genetic Methylation Testing

Genetic methylation testing sits at the intersection of genetics and epigenetics – the study of how your environment and lifestyle influence gene expression. Methylation is a chemical process that turns genes on or off, and it plays a critical role in inflammation, detoxification, mood regulation, and cellular aging.

Variants in the MTHFR gene, for instance, can impair the body’s ability to convert folate into its active form, affecting everything from cardiovascular health to mental well-being. Methylation testing helps practitioners understand these upstream mechanisms and address the root causes of chronic symptoms rather than simply managing them downstream.

From a systems-based medicine perspective, methylation testing is one of the most comprehensive tools available for understanding how your genetic blueprint interacts with your daily life.

Learn more: The Perils of Poor Methylation

Is Genetic Testing Accurate? Understanding the Limits

Genetic testing is highly accurate for what it measures. Laboratory processes are precise, and most tests undergo rigorous quality controls. 

But it’s absolutely crucial to remember that a positive result for a genetic variant doesn’t guarantee you’ll develop a condition. Many variants are based on probability, which means they don’t officially determine any specific result. Similarly, a negative result doesn’t mean zero risk (7). Lifestyle, environment, epigenetics, and multiple interacting genes all shape health outcomes in ways that no single test captures completely.

This is why genetic testing is most valuable as one layer of a broader clinical picture – not as a standalone verdict. At hol+, genetic results are interpreted within the context of your full health history, symptoms, lifestyle factors, and other diagnostic data. The goal is always whole person health, not isolated data points.

Need clarity about your genetic results? Contact us for a free, 15-minute consultation today>>

How to Interpret Genetic Test Results: What the Numbers Actually Mean

Understanding Variants of Uncertain Significance (VUS)

When a genetic test returns a “variant of uncertain significance” (VUS), it can feel unsettling. A VUS means a genetic change was detected, but current research hasn’t yet determined whether it increases health risk (8). This is more common than many people expect, particularly in cancer gene panels.

The honest answer is that a VUS is not a diagnosis, nor is it something to dismiss. It’s a signal worth monitoring. As the scientific literature grows, many VUS classifications are reclassified over time, and often as benign.

The Role of Clinical Context in Interpreting Results

Important rule: Genetic results don’t exist in a vacuum. A variant that carries elevated risk in someone with a strong family history may carry different clinical weight in someone without it. An MTHFR variant matters differently depending on diet, stress load, and other metabolic markers (9).

This is where working with a clinician experienced in personalized medicine becomes essential. The genetic data tells part of the story. Your practitioner helps complete the picture, and – most importantly – helps you act on it in a way that’s grounded and realistic rather than alarming.

How Genetic Testing Fits Into a Whole Person Health Strategy

Genetic testing deepens clinical care, but doesn’t replace it. When used thoughtfully, it shifts medicine from reactive to proactive, from generalized protocols to truly personalized treatment paths.

At hol+, genetic insights are integrated into a broader framework of doctor-led holistic care. This means your results are considered alongside nutritional status, hormonal health, gut function, mental well-being, and lifestyle factors. The result is a clearer map of your human health operating system – where the bottlenecks are, what’s driving symptoms that may have gone unexplained for years, and where targeted support can make the greatest difference.

For families with complex health histories, this integrative approach can be genuinely transformative. With the right team and a proactive plan, identifying a hereditary risk becomes a starting point for meaningful change.

Taking the Next Step: From Information to Action

The real value of genetic testing happens when results are connected to a thoughtful, individualized health plan that accounts for the whole person, not just a sequence of base pairs.

If you’re considering genetic testing, start by speaking with a practitioner who understands how to integrate these results into a comprehensive care plan. Ask about which tests are most relevant to your health history and goals. They’re data, which, in the right hands, is extremely powerful.

At hol+, our team of integrative clinicians is here to help you understand what your genetic results mean, what they don’t mean, and how to use them as part of a living, evolving approach to your health..

Frequently Asked Questions About Genetic Testing for Health

What is genetic testing used for in healthcare?

Genetic testing is used to identify inherited disease risk, confirm diagnoses, guide medication selection, and assess cellular health at a molecular level. Applications include genetic testing for cancer, pharmacogenomic testing for medication compatibility, and methylation testing for metabolic health.

How accurate is genetic testing for predicting disease?

Genetic testing is technically accurate in detecting the variants it’s designed to identify. However, most genetic variants are probabilistic – they indicate elevated risk, not certainty. Clinical interpretation by a qualified practitioner is essential to understand what a result means for your individual health.

What does genetic methylation testing show?

Genetic methylation testing examines variants – such as those in the MTHFR gene – that affect how your body processes nutrients, manages inflammation, and regulates gene expression. It helps identify upstream drivers of chronic symptoms and supports a root cause medicine approach to treatment.

Who should consider genetic testing for breast cancer?

Genetic testing for breast cancer is typically recommended for individuals with a personal or family history of breast, ovarian, or related cancers, or those of Ashkenazi Jewish descent (which carries a higher prevalence of BRCA1/BRCA2 mutations). A genetic counselor or integrative physician can help assess whether testing is appropriate.

Can genetic testing tell me how to adjust my medications?

Yes. Pharmacogenomic testing – genetic testing for medication – reveals how your body metabolizes specific drugs based on enzyme-encoding gene variants. This information allows clinicians to select the most effective medication and dose for your unique biology, reducing trial-and-error and minimizing side effects.

How do I interpret a variant of uncertain significance in my genetic results?

A variant of uncertain significance (VUS) means a genetic change was found, but its health impact hasn’t yet been established by current research. A VUS is not a diagnosis. It should be monitored and revisited as the scientific evidence evolves, always within the context of your broader clinical picture.