Quest diagnostics empowers people to take action to improve health outcomes derived from the worlds largest database of clinical lab results our diagnostic insights reveal new avenues to identify and treat disease inspire healthy behaviors and improve health care management. Blood tests show whether the levels of different substances in your blood fall within a normal range for many blood substances the normal range is the range of levels seen in 95 percent of healthy people in a certain group. Far too often this blood work does not even test for important markers of disease risk the consequences of failing to analyze blood for proven markers of disease risk are needless disability and death blood tests have benefits that go far beyond disease prevention
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