The cutoff normal individuals from those with primary hyperaldosteronism is significantly affected by the conditions of testing, such as posture and time of day. On average, an ARR cutoff of 23.6 ng/dL per ng/(mL·h), expressed in alternative units as 650[2] pmol/liter per µg/(liter·h), has been estimated to have a sensitivity of 97% and specificity of 94%.[3] An ARR value in an individual that is higher than the cutoff indicates primary hyperaldosteronism.