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. Author manuscript; available in PMC: 2015 Mar 15.
Published in final edited form as: J Chromatogr B Analyt Technol Biomed Life Sci. 2014 Feb 4;0:62–67. doi: 10.1016/j.jchromb.2014.01.045

Table 2.

Concentration of 1,25-(OH)2-D3,D2 in pg/ml by different LC/MS methods and by RIA.

Amplifex RIA PTAD
14 11 9
23 30 33
39 36
48 41 30
51 50 35
67 52 61
64 60 61
90 72 60
79 85
88 95 105
98 100 97
17 15
19 23
37 35 42
44 48 32
34 55
75 66
43 69
89 75 82
87 83