Seated Saline Suppression Test for Lateralizing Primary Aldosteronism

Confirmatory testing to identify lateralizing primary aldosteronism (PA) is of uncertain benefit.

Blinded clinical trial where patients with high-risk features for PA underwent the seated saline suppression test (SSST). All patients received adrenal vein sampling, where lateralization was defined by an aldosterone/cortisol ratio ≥3:1 comparing the dominant versus the nondominant sides. The primary outcome was the overall diagnostic accuracy of the SSST in identifying lateralizing PA using postinfusion aldosterone concentrations of ≥140 pmol/L (5.0 ng/dL) and ≥280 pmol/L (10.1 ng/dL) with immunoassay, and ≥162 pmol/L (5.8 ng/dL) with liquid chromatography/tandem mass spectrometry.