<prompt> Which is not true of hypocalcaemia:Can occur in hypoparathyroidismLatent tetany is seenProlonged QT intervalaInverse relation with Me levels  <response>: Answer is D Inverse relation with Mg levels : Magnesium levels usually bear a direct, not an inverse, relationship with serum Ca levels. Severe hypo-magnesemia is associated with hypocalcemia. Intracellular magnesium deficiency results in Hypocalcemia due to : - Impaired PTH secretion - Diminished responsiveness to PTH Hypoparathyroidism is a known cause of Hypocalcemia - Harrison QT interval on ECG is prolonged in Hypocalcemia and is shoened in hypercalcemia - Harrison Tetany is a recognized feature of hypocalcemia, but it may also occur with hypomagnesemia and respiratory alkalosis - Harrison 