. Author manuscript; available in PMC: 2010 Aug 1.

Published in final edited form as: Arthritis Rheum. 2009 Aug;60(8):2480–2489. doi: 10.1002/art.24684

Table 1.

Summary of IgA and IgM anti-B2GPI assay precision.

Samples	Intra-assay mean (SD), CV^§	Inter-assay mean, SD, CV^§	Overall mean, SD, CV^§
Anti-B2GPI IgA
negative	6.1 (0.2), 2.9	5.8 (0.2), 3	5.9 (0.5), 7.9
lower +	29 (0.8), 2.7	31.8 (2.7), 8.4	31.8 (2.6), 8.1
higher +	125 (1.4), 1.1	127 (3.3), 2.6	127 (4.9), 3.9
Anti-B2GPI IgM
negative	3.5 (0.2), 6.3	3.9 (0.4), 10.2	3.8 (0.4), 11.6
lower +	33.8 (1.1), 3.4	33 (2.7), 8.3	33 (2.9), 8.8
higher +	216.3 (4.2), 1.9	214.9 (10), 4.7	214.9 (10.8), 5.1

^§

Mean values ± SD are expressed in units; the coefficient of variation (CV) as percentage. Each sample (negative, low and high positive) for IgA and IgM anti-B2GPI was run five times on five consecutive days.