A nurse is reviewing a clients laboratory report and notes that the serum calcium level is 4.0 mg/dL. The nurse understands that which condition most likely caused this serum calcium level?

Prolonged bed rest

Rationale: The normal serum calcium level is 8.6 to 10.0 mg/dL. A client with a serum calcium level of 4.0 mg/dL is experiencing hypocalcemia. The excessive ingestion of vitamin D and hyperparathyroidism are causative factors associated with hypercalcemia. End-stage renal disease, rather than renal insufficiency, is a cause of hypocalcemia. Prolonged bed rest is a cause of hypocalcemia. Although immobilization initially can cause hypercalcemia, the long-term effect of prolonged bed rest is hypocalcemia. Test-Taking Strategy: Note the strategic words MOST LIKELY. First, you must determine that the client is experiencing hypocalcemia. This should assist in eliminating option D. Next, you must recall the causative factors associated with hypocalcemia to direct you to option A. If you had difficulty with the question, review the causative factors associated with hypocalcemia.