Not all diseases are caused by genes. Many conditions are triggered by environmental and lifestyle factors that often interact with your genes. A sample of your cheek cells containing your DNA sequencing is sent to a lab where geneticists can compare it with “normal” or disease-causing sequences. You’ll receive a probability-a measure of how much your genes increase your risk of developing the disease. Then, it’s up to your doctor to figure out what these genes (in combination with your lifestyle, family history and other risk factors) mean for your health.