Figure 3From: Method for simultaneous analysis of eight analogues of vitamin D using liquid chromatography tandem mass spectrometryA: Bland- Altman plot comparing the 25OHD concentrations obtained with the new assay (M1) to DEQAS. Lines represent limits of agreement. The mean difference is −5.329, the lower limit line is at −15.774 and the upper limit is at 5.116. B: Correlation between the 25OHD concentrations obtained using the new assay and the ALTM.Back to article page