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B12 is a vitamin that is important for functions of blood cell production, brain health, and nerve functioning. Low levels of B12 can be a sign of anemia or hyperthyroidism. High levels increase the risk of cancer. Early detection is the key to preventing...

This test measures your levels of vitamin D which is necessary for healthy teeth and bones. Your body produces vitamin D after exposure to sunlight and from fortified foods. This test does not require fasting....