<prompt> Which of the following is not associated with hypercalcemia?Tumor lysis syndromeHyperparathyroidsmMultiple sclerosisSarcoidosis  <response>: This is a question repeated often. Tumor lysis syndrome causes hypocalcemia. A normal serum calcium level is 8-10 mgdL 2-2.5 mmolL with some interlaboratory variation in the reference range, and hypercalcemia is defined as a serum calcium level greater than 10.5 mgdL 2.5 mmolL. 