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Underactive parathyroid gland or hyposecretion of parathyroid gland will cause hypocalcemia and hyperphosphatemia. Underactive parathyroid gland will never decrease the phosphorus level.
Normally parathyroid gland will maintain blood calcium level. Hypothyroidism will decrease the calcium level.
In question it is given as underactive parathyroid gland will decrease phosphorus level. Actually the question is to be underactive parathyroid gland will decrease calcium level. Please post the question properly.
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