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Lab Dept:
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Chemistry
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Test Name:
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PHOSPHORUS
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General Information
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Lab Order Codes:
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PO4
Note: Also included in Renal Panel (RENP)
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Synonyms:
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PO4; Phosphate
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CPT Codes:
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84100 – Phosphorus inorganic (phosphate)
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Test Includes:
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Phosphorus concentration reported in mg/dL.
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Logistics
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Test Indications:
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Useful for the evaluation of phosphorus metabolism and calcium/phosphorus balance. Phosphorus in the form of inorganic phosphate is important and widely distributed in the human body, 85% skeletal. Serum phosphorus concentrations are diet dependant.
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Lab Testing Sections:
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Chemistry
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Phone Numbers:
Minneapolis:
Saint Paul:
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612-813-6280
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651-220-6550
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Test Availability:
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Daily, 24 hours
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Turnaround Time:
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4 hours
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Special Instructions:
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N/A
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Specimen
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Specimen Type:
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Whole blood
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Container:
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Green top (Li Heparin) tube preferred
Alternate tube: Red top (plain, no gel) tube
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Draw Volume:
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0.6 mL blood
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Processed Volume:
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0.2 mL serum/plasma
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Collection:
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Routine venipuncture. Mix tubes containing anticoagulant by gentle inversion.
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Special Processing:
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Lab Staff: Centrifuge specimen, remove serum/plasma aliquot into a plastic sample cup. Store at refrigerated temperatures.
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Patient Preparation:
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None
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Sample Rejection:
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Mislabeled or unlabeled specimen
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Interpretive
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Reference Range:
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Age:
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Range (mg/dL)
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0 – 2 days:
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3.5 – 9.5 mg/dL
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2 days – 1 year:
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4.5 – 6.5 mg/dL
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1 –-18 years:
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4.5 – 5.5 mg/dL
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>18 years:
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2.7 – 4.5 mg/dL
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Critical Values:
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<2.0 or >10.0 mg/dL
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Limitations:
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Phosphorus concentrations are decreased by excess hemolysis and increased by excess lipemia and bilirubin.
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Methodology:
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Phosphomolybdate
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References:
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PHOS Flex® reagent cartridge insert sheet Siemens Healthcare Diagnostics, Inc. (2008-03-27) 717061.001 – US, Rev L
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Jacobs & DeMott Laboratory Test Handbook (2001) Lexi-Comp, Inc, Hudson, OH, 5th Edition
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Biorad Liquichek Unassayed Chemistry Control Product Insert Bio-Rad Laboratories, Irvine, CA 92618
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