Abnormal response to endocrine stimulation test Blunted aldosterone response to aldosterone suppression test 2024-02-24T10:53:49Z For instance, the sral sodium loading test involves increasing sodium intake to over 200 mmol/d for 3 days and determining urinary aldosterone from the morning of day 3 to the morning of day 4. The test is abnormal if the amount of urinary aldosterone is above the upper limit of normal. An abnormal test result generally indicates primary aldosteronism. A non-suppressible aldosterone excess, defined as an abnormal result of one of any four suppression tests. These tests use oral sodium loading, oral fludrocortisone, oral captopril, or saline infusion to suppress aldosterone secretion.