Purpose: To compare the diagnostic accuracy of plasma aldosterone concentration (PAC), renin activity (PRA) and aldosterone-to-renin ratio (ARR) in primary aldosteronism (PA) using radioimmunoassay (RIA) chemiluminescence immunoassay (CLIA) methods.
 Methods: Both RIA CLIA were used to analyze PAC, PRA ARR with subjects standing or supine position, before after a saline infusion tes...