Hyperreninemia and Hypoaldosteronism in a Child With Short StatureAshraf, Ambika MD; McCormick, Kenneth MDAuthor Information From the Department of Pediatric Endocrinology, Children's Hospital, UAB, Birmingham, Alabama. Reprints: Ambika Ashraf, MD, 1600, ACC Suite 608, Seventh Avenue South, Children's Hospital, UAB, Birmingham, AL 35233. E-mail: AAshraf@peds.uab.edu. The Endocrinologist: November/December 2004 - Volume 14 - Issue 6 - pp 313-316 Buy Abstract We report a child with primary renal tubular alkalosis who had hypokalemia, profound hyperreninemia, and hypoaldosteronism. A 14-year-old girl presented with short stature and delayed puberty. Laboratory evaluation disclosed hypokalemia, hypochloremia, hypomagnesemia, alkalosis, hypocalciuria, and a markedly elevated rennin at 2859 ng/mL/h and a suppressed aldosterone at 2.5 ng/dL. Subsequently, as the serum potassium normalized, renin levels gradually declined (16.78 ng/mL/h) and, despite this renin reduction, aldosterone levels progressively increased (61.7 ng/dL). The patient's clinical course highlights the preeminent role of potassium, as a direct regulator of aldosterone synthesis, versus the indirect action of renin. This observation suggests potassium is by and large a major regulator of aldosterone synthesis in renal salt-wasting disorders. © 2004 Lippincott Williams & Wilkins, Inc.