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Participating organizations must be Medicare Part Benrolled providers/suppliers and eligible to bill for Medicare Physician Fee Schedule services
Its possible to have "normal" levels on this test but still have a functional deficiency where your body can't actually use the B12 it has
Cox HD, Smeal SJ, Hughes CM, Cox JE, Eichner D
75 , 76 , 77 For example, based on data from a study in Europe and a study in the United States, of people age 6569, the risk of developing dementia by their early to mid80s was 5% to 7% among those with no copies of the e4 form, 15% to 16% among those with one copy, and 31% to 40% among those with two copies
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