Problems with direct 25-hydroxyvitamin D assays, and the target amount of vitamin D nutrition desirable for patients with osteoporosis.
Vieth
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D015982:Bias; D002762:Cholecalciferol / Q000008:administration & dosage*; D019411:Clinical Laboratory Techniques / Q000592:standards*; D006801:Humans; D010024:Osteoporosis / Q000188:drug therapy; D011863:Radioimmunoassay / Q000592:standards; D012016:Reference Values; D014807:Vitamin D / Q000031:analogs & derivatives* / Q000097:blood
D014807:Vitamin D; D002762:Cholecalciferol; C104450:25-hydroxyvitamin D