Hypertension (HPT) is a very common disease, expensive to treat with serious morbidity and mortality. In Malaysia, from the NHMS III conducted in 2006, HPT affects more than 36% of adults. Essential HPT (HPT with no identifiable cause) accounts for approximately 85% of cases, whereas 15% have identifiable conditions (secondary cause). The detection of a secondary cause of HPT is important as the condition is reversible when detected early. Primary aldosteronism (PA) has been identified as the commonest cause of secondary HPT. At present, PA has been regarded as the commonest and potentially curable, with a prevalence of 5-13% [1-7]. If this condition is detected early, the chances of cure from hypertension have been reported up to 80% of cases.