Phosphate is the main anion of the intra-cellular fluid and present in teeth and bones along with calcium. It is also present in cells as phospholipids, ATP or combined with nucleic acids. The main dietary sources of phosphorus are milk, milk products, whole grains, nuts and legumes.
It plays a vital role in buffering system of the body and regulates erythrocyte-glucose metabolism in serum.
Normal plasma phosphate concentration is 1.7 – 2.6 mEq/litre.
Daily requirement of phosphate is same as calcium and high amount of phosphate is require in children and during pregnancy and lactation.