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.
Food sources of phosphorus occur both naturally and as food additives (phosphate salts) used in processed foods to add moisture, smoothness, and as a binding agent. Foods that are high in phosphorus include milk (234 milligrams in 8 ounces), milk products, poultry, fish, meat, eggs, grains, and legumes. Certain sodas that use phosphoric acid as an ingredient (colas and a few others) have a small amount of phosphorus added (less than 50 milligrams in 12 ounces). Of the phosphorus sources, only milk (and milk products) also contain high amounts of calcium.
Vitamin D supplementation is appropriate for patients with vitamin D deficiency. Most patients respond to oral vitamin D-2 supplements, commonly available in over-the-counter multivitamin preparations. Because the kidneys are responsible for the final 1-alpha hydroxylation of vitamin D, patients with significant renal insufficiency may not be able to metabolize liver-derived 24 hydroxyvitamin D-3 to its active dihydroxy form. These patients benefit from oral 1, 25 dihydroxyvitamin D-3 supplements. Because vitamin D enhances calcium and phosphate absorption, frequent monitoring of both is required.
Treatment consists of proper intake of phosphorus and calcium rich food:
Foods Rich In Phosphorus
Cereals = rice, wheat germ, maize, Italian millet, finger millet.
Test Method 1 : You don't typically need to fast before this test. Your doctor will let you know if they want you to fast for any reason.
The test involves a simple blood draw. Your doctor or a nurse will use a small needle to collect a sample of blood from a vein in your arm or hand. They'll send the sample to a laboratory for analysis.