SBMF Online Payment ▶

test directorySearch Results

Click here to search again.

Test Name:
Phosphorus, Serum or Plasma


  • SBMF No:
    29168
  • Performance Lab Name:
    Automated Lab
  • Test Mnemonic:
    PHOS-
  • ABN:
    Not required
  • CPT Code:
    84100
  • LOINC Code:
    2777-1
  • Also Known As:
    PO4
  • Spec Type:
    Serum
  • Spec Container:
    Gold top (SST) or red top (serum) tube
  • Alt Spec Type:
    Plasma
  • Alt Spec Container:
    Lavender top (EDTA) tube or green top (lithium heparin) tube
  • Pref Vol:
    1.0 mL
  • Min Vol:
    0.3 mL
  • Fasting:
    Yes
  • Patient Prep:
    Fasting specimen preferred (fasting at least 12 hours)
  • Spec Collect:
    Routine venipuncture
  • Spec Process:
    Serum sample tubes, clot 30 minutes
    Promptly centrifuge 15 minutes
    Immediately transfer serum or plasma to separate plastic tube and freeze
  • Spec Store Transport:
    Refrigerated (4 days) or frozen
  • Spec Stability:
    24 hours room temperature (20-30°C)
    4 days refrigerated (2-8°C)
    1 year frozen (-20°C) – Do not use frost-free units that undergo repeated freeze/thaw cycles
  • Spec Reject:
    Hemolyzed sample
  • Methodology:
    Photometric
  • Use:
    Evaluate phosphorus metabolism, calcium/phosphorus balance
  • Clinical Significance:
    Eighty eight percent of the phosphorus contained in the body is localized in bone in the form of calcium phosphate as the apatite Ca2+[Ca3(PO4)2]3 2-. The remainder is involved in intermediary carbohydrate metabolism and in physiologically important substances such as phospholipids, nucleic acids and ATP. Phosphorus occurs in blood in the form of inorganic phosphate and in organically bound phosphoric acid. The small amount of extracellular organic phosphorus is found almost exclusively in the form of phospholipids. The ratio of phosphate to calcium in the blood is approximately 6:10. An increase in the level of phosphorus causes a decrease in the calcium level. The mechanism is influenced by interactions between parathormone and vitamin D. Hypoparathyroidism, vitamin D intoxication and renal failure with decreased glomerular phosphate filtration give rise to hyperphosphatemia. Hypophosphatemia occurs in rickets, hyperparathyroidism and Fanconi’s syndrome.
  • Reference Range:
    0-10 years: 4.0-7.0 mg/dL
    10+ years: 2.6-4.5 mg/dL
  • Critical Low Value:
    1.5 mg/dL
  • Day Run:
    Sun-Sat (daily)
  • Time Run:
    As received
  • Time Reported:
    4 hours
  • Test Type:
    CHEMISTRY

Home > Test Directory > Search Results

Test Directory