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Test Code Billings Clinic: 4019 Phosphorus, Plasma or Serum

Performing Laboratory

Billings Clinic Laboratory: Chemistry

Useful For

Phosphate levels may be used in the diagnosis and management of a variety of disorders including bone, parathyroid and renal disease.

Methodology

Phosphomolybdate UV/Bichromatic Endpoint

Specimen Requirements

Submit only 1 of the following specimens:

Serum or plasma should be physically separated from cells as soon as possible with a maximum limit of two hours from the time of collection.

 

Plasma

  • Draw blood in a green-top (lithium heparin) tube(s).
  • Spin down and send 1.0 mL of heparinized plasma frozen.

 

Serum

  • Draw blood in a plain, red-top tube(s) or a serum gel tube(s).
  • Spin down and send 1.0 mL of serum frozen

Storage/Stability

Specimen Type Temperature Time
Serum, Plasma Refrigerated 2 days
  Frozen (preferred) 6 months

 

Reject Due To

  • Gross hemolysis
  • Gross lipemia

Reference Values

Normal Values

0 days - 9 days:    4.5-9.0 mg/dL

9 days - 2 years:   4.0-6.5 mg/dl

2 years - 9 years:   3.2-5.8 mg/dl

9 years - 15 years   3.3-5.4 mg/dl

15 years - 150 years   2.5-4.9 mg/dl

 

Call-back values

0 days - 2 years:    <2.5 mg/dL

2 years - 15 years:  < 2.0 mg/dL

15 years - 18 years:  <1.5 mg/dL

18 years - 150 years:  <1.0 mg/dL

Day(s) Test Set Up

Daily

Test Classification and CPT Coding

84100 - Phosphorus

LOINC Code Information

Reporting Name LOINC Code
Phosphorus 2777-1