Alcoholism-rationale: the normal serum phosphorus level is 2.7 to 4.5 mg/dl. the client is experiencing hypophosphatemia. causative factors relate to malnutrition or starvation and the use of aluminum hydroxide-based or magnesium-based antacids. malnutrition is associated with alcoholism. hypoparathyroidism, tumor lysis syndrome, and renal insufficiency are causative factors of hyperphosphatemia.test-taking strategy: first you must determine that the client is experiencing hypophosphatemia. from this point, you must know the causes of hypophosphatemia. if you had difficulty with this question, review the causative factors associated with hypophosphatemia.