Conversion between renin activity and mass.
Different assays were used for the measurement of renin at the three sites. CUH and GSTT measured renin mass (mU/L), while SBH measured renin activity (nmol/L/hr). A renin mass level (pg/ml) was also sent off at selected (baseline and 6-9 month) visits at the SBH site to allow within-patient comparisons between renin mass and activity. A conversion of 1.67 was used to convert between renin mass measured in pg/ml to mU/L. The scatter plot above shows correlation between renin activity and mass within the SBH cohort. Pearson’s correlation 
