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Other factors that can sometimes cause phosphate levels to rise include excess vitamin D, decrease in magnesium levels in the body and for women, pregnancy. Low phosphate levels, on the other hand are indicative of hyperparathyroidism, osteomalacia, kidney and liver infections, lack of vitamin D and intense burns.
The kidneys help control the amount of phosphate in the blood. Extra phosphate is filtered by the kidneys and passes out of the body in the urine. A high level of phosphate in the blood is usually caused by a kidney problem. The amount of phosphate in the blood affects the level of calcium in the blood.