Aldosterone was a hormone secreted by the adrenal gland. It was measured in nanograms per deciliters (ng/dl).
In 3189, an atomic scan performed on Philippa Georgiou's endocrine system/nervous system revealed that her aldosterone level was 15 ng/dl. It was noted on her scan that she was supine, or lying down, when the scan was done. (DIS: "The Sanctuary")