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

Fig 2. Effects of storage temperature on the measurement of 25OHD using the Siemens system.

Fig 2

I shows the plot of 25OHD results for samples stored at 4°C for 48 h before measurement. II shows the plot of 25OHD results for samples stored at -80°C for 48 h before measurement; III and IV respectively show the Passing-Bablok regression analysis and Bland-Altman plot for 25OHD results obtained using the Siemens system (IMPROVEVACUTER® tubes with serum clot activator and gel) after storage at -80°C for 48 h and immediately after collection. V and VI respectively show the Passing-Bablok regression analysis and Bland-Altman plot for 25OHD results for the Siemens system using IMPROVEVACUTER® tubes with serum clot activator and gel and VACUETTE® tubes with serum clot activator and gel measured after storage at -80°C for 48 h.