More than 60,000 miles of blood vessels twist and branch throughout your body. Just look at the tangle of tiny capillaries in this never-before-seen image of a real index finger. Your arteries and veins are a superhighway for nearly everything your body takes in and produces. That’s why a few drops of blood can give an invaluable snapshot of your health. A simple blood test at a medical checkup is essential in determining your health baseline. It can tell whether your cholesterol levels are ideal, detect minerals and compounds that show how well your major organs are functioning, take a count of your blood cells and find health clues in your genes.

Analysis of your urine, skin, even your hair add details to the story. Other basic facts—your weight, age, habits, history—complete the picture. Baselining your health helps you, and your physician, see where your journey to wellness begins.

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