Figure 2From: Development and evaluation of an immuno-MALDI (iMALDI) assay for angiotensin I and the diagnosis of secondary hypertensionCorrelation of RIA with LC/ESI-MS/MS. PRA was determined by RIA and LC/ESI-MS/MS for 64 patients. The correlation is shown by Passing and Bablok regression as well as a Bland Altman difference plot. Shaded regions represent a 95% confidence interval.Back to article page