Phosphorus tests are most often ordered along with other tests, such as those for calcium, parathyroid hormone (PTH), and/or vitamin D, to help diagnose and/or monitor treatment of various conditions that cause calcium and phosphorus imbalances. Phosphorus deficiencies may be seen with malnutrition, malabsorption, acid-base imbalances, hypercalcemia, and with disorders that affect kidney function. Soft drinks and pre-packaged food items are high in phosphorus content, which some nutritionists believe contributes to over-consumption of phosphorus. Blood and urine levels of phosphorus may be affected by the use of enemas and laxatives containing sodium phosphate, excess dietary vitamin D supplements, and by intravenous glucose administration.
