Vitamin D intoxication is an etiology of which calcium abnormality?

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Vitamin D intoxication raises calcium levels because too much active vitamin D increases calcium absorption from the gut and promotes bone resorption, leading to hypercalcemia. This is not a cause of high potassium, low sodium, or low calcium, so the disturbance is hypercalcemia, not hyperkalemia, hyponatremia, or hypocalcemia. In this scenario, calcium is elevated and PTH is suppressed due to the high calcium, which helps differentiate it from other causes. Clinically, expect symptoms related to high calcium and address by stopping excess vitamin D and correcting fluids and calcium as needed.