- The aldosterone-renin ratio based on the plasma renin activity and the direct renin assay for diagnosing aldosterone-producing adenoma. Rossi, G.P., Barisa, M., Belfiore, A., Desideri, G., Ferri, C., Letizia, C., Maccario, M., Morganti, A., Palumbo, G., Patalano, A., Roman, E., Seccia, T.M., Pessina, A.C., Mantero, F. J. Hypertens. (2010)