Genetic Testing in Primary Care: Know Your Risks Before They Become Reality

Medicine works best when it’s proactive. Genetic testing is one of the most powerful tools I have for shifting care from reactive to preventive — identifying risks before they become diagnoses. In my Plano, TX practice, I incorporate genetic testing as part of a personalized care strategy for patients with relevant family histories or specific clinical concerns.

This isn’t about predicting the future. It’s about having better information to make smarter decisions today.

What Genetic Testing Can Reveal

Hereditary Cancer Risk

Certain gene variants significantly elevate the lifetime risk of developing specific cancers. The most well-known are BRCA1 and BRCA2 mutations, which increase risk for breast and ovarian cancer. But there are others:

Lynch syndrome genes (MLH1, MSH2, MSH6): Associated with elevated risk of colorectal, uterine, and other cancers
BRCA1/BRCA2: Breast, ovarian, and in men, prostate cancer risk
PALB2, CHEK2: Additional breast cancer risk genes that are increasingly included in modern panels

Knowing you carry a variant doesn’t mean you’ll develop cancer. It means we screen more aggressively, monitor more closely, and involve specialists earlier when needed.

Cardiovascular Genetic Risk

Inherited conditions like familial hypercholesterolemia (FH) cause cholesterol levels that don’t respond normally to diet and lifestyle changes. FH is significantly underdiagnosed. If your LDL is persistently elevated despite a healthy lifestyle, or if family members had heart attacks young, a genetic panel can confirm whether there’s a hereditary cause driving it.

Pharmacogenomics: How Your Genes Affect Medications

This is one of the most immediately actionable areas of genetic testing. Pharmacogenomics looks at gene variants that affect how you metabolize specific drugs. Results can indicate whether a standard medication dose will work, be ineffective, or cause adverse effects in your particular biology.

Common applications include:

Antidepressants and psychiatric medications (CYP2D6, CYP2C19 pathways)
Blood thinners like clopidogrel (Plavix) — some patients are poor metabolizers and the drug provides little benefit
Pain medications
Certain heart medications and statins

This kind of testing helps me prescribe more precisely from the start, rather than adjusting through trial and error.

What to Expect from Genetic Testing

The test itself is straightforward — typically a blood draw or cheek swab. Results are reviewed with me in context, not sent to you as raw data to interpret alone. I walk through what the findings mean, what they don’t mean, and what changes to your care plan, if any, are warranted.

Patients sometimes worry about privacy. Genetic test results are protected under GINA (Genetic Information Nondiscrimination Act) for health insurance and employment purposes. I can address specific concerns in your appointment.

Who Should Consider Genetic Testing

Patients with a strong family history of cancer (especially early-onset)
Patients with persistently abnormal cholesterol despite lifestyle changes
Patients who have had unusual or poor responses to medications
Patients from populations with known higher carrier rates of specific variants
Anyone curious about personalizing their preventive care