Lt green plasma separator (PST)
Gold serum separator (SST) tube
Refrigerated (preferred) - 4 days
Ambient - 1 day
Frozen - 12 months
|10 days||4.5 - 9.0|
|1 year||4.5 - 6.5|
|12 years||3.4 - 5.9|
|Adult||2.3 - 4.7|
Low: < 1.0 mg/dL
High: >10.0 mg/dL
The human body contains nearly a kilogram of phosphorus. Nearly 80% of this amount is in the form of calcium phosphate salts which are contained in, and give rigidity to, bone. The rest is distributed through all other cells of the body where its role is important and complex. Much of the metabolism of carbohydrates involves esterification of intermediary metabolites with phosphate. In fact, the metabolism of all food terminates in the formation of adenosine triphosphate (ATP). The breakdown of ATP to ADP produces the energy needed for chemical reactions involved in cell function, maintenance, and growth. Phosphate is also an integral part of the structure of the nucleic acids, deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) which transfer genetic information.
Abnormal serum phosphate levels are most commonly seen in kidney, bone, and parathyroid diseases. Calcium and phosphorus in serum usually exhibit a reciprocal relationship. Increased serum phosphorus may occur in hypervitaminosis D, hypoparathyroidism, and renal failure. Reduced serum phosphorus levels are seen in rickets (Vitamin D deficiency), hyperparathyroidism, and Fanconi’s syndrome.