PTH and Hypocalcemia: Electrolyte abnormalities that converge on hypomagnesemia and serve as important diagnostic clues to its presence include concomitant hypokalemia (due to impaired Na–K–ATPase and urinary potassium wasting) and hypocalcemia (due both to lower parathyroid hormone secretion and end-organ resistance to its effect [41]); therefore, measurement of potassium and calcium levels should be sought as supportive evidence.