Calcium And Phosphates - Deficiency Test
The calcium and phosphates test measures the urine levels of calcium and phosphates, elements essential for the formation and resorption of bone. Urine calcium and phosphate levels generally parallel serum levels.
Normally absorbed in the upper intestine and excreted in stool and urine, calcium and phosphates help maintain tissue and fluid pH, electrolyte balance in cells and extracellular fluids, and permeability of cell membranes. Calcium promotes enzymatic processes, aids blood coagulation, and lowers neuromuscular irritability; phosphates aid carbohydrate metabolism.
Procedure and posttest care
Normal values depend on dietary intake. For a normal diet, urine calcium levels for a 24-hour period range from 25 to 300 mg/24 hours in males and 20 to 275 mg/24 hours in females. Normal excretion of phosphate is less than 1,000 mg/24 hours.
A variety of disorders may affect calcium and phosphorus levels. (See Disorders that affect urine calcium and urine phosphorus levels.)
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