Figure 518

Causes of hypocalcemia (decrease in ionized plasma calcium).

Lack of parathyroid hormone (PTH)

Increased calcium complexation

After thyroidectomy or parathyroidectomy

"Bone hunger" after parathyroidectomy

Hereditary (congenital) hypoparathyroidism


Pseudohypoparathyroidism (lack of

Acute pancreatitis

effective PTH)

Tumor lysis syndrome

Hypomagnesemia (blocks PTH secretion)


Lack of Vitamin D

Malignancy (increased osteoblastic activity)

Dietary deficiency or

malabsorption (osteomalacia)

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