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. Author manuscript; available in PMC: 2012 Jan 1.
Published in final edited form as: J Sep Sci. 2010 Nov 16;34(1):11–20. doi: 10.1002/jssc.201000410

Table V.

Determination of 25(OH)D2 and 25(OH)D3 levels in NIST samples.

NIST -Level 1 Certified
conc.
[ng/mL]
Measured
conc.
[ng/mL]
Accuracy
[%]
RSD [%]
25OH-D2 ND ND ND ND
25OH-D3 23.9 26.6 111.2 2.0
NIST -Level 2
25OH-D2 1.7 1.7 102.0 23.7
25OH-D3 12.3 12.3 100.2 2.7
NIST -Level 3
25OH-D2 26.4 24.0 90.9 1.5
25OH-D3 18.5 19.4 104.7 0.6
NIST -Level 4
25OH-D2 2.4 2.4 98.5 5.4
25OH-D3 70.7a 65.9a 93.5 5.5
a

Value represents the sum of 25(OH)D3 and 3-epi-25(OH)D3