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. 2016 Nov 10;11(11):e0166327. doi: 10.1371/journal.pone.0166327

Fig 1. Comparison of 25OHD results obtained using the Siemens ADVIA Centaur XP system for all types of tubes and those obtained using LC-MS/MS analysis (averaged results).

Fig 1

I–IV are Passing-Bablok regression analyses for the Siemens system (5-mL BD Vacutainer® SST tubes, IMPROVEVACUTER® tubes with serum clot activator and gel, VACUETTE® 4-mL no-additive tubes, and VACUETTE® tubes with serum clot activator and gel, respectively) and 25OHD results from the LC-MS/MS analysis (averaged results). V–VIII are Bland-Altman plots showing the 25OHD bias between the Siemens system using the four types of tubes and LC-MS/MS (averaged results).