Clinics and Departments

Laboratory Services

Lab Dept:

Chemistry

Test Name:

PHOSPHORUS

General Information

Lab Order Codes:

PO4
Note: Also included in Renal Panel (RENP)

Synonyms:

PO4; Phosphate

CPT Codes:

84100 – Phosphorus inorganic (phosphate)

Test Includes:

Phosphorus concentration reported in mg/dL.

Logistics

Test Indications:

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.

Lab Testing Sections:

Chemistry

Phone Numbers:

Minneapolis:

Saint Paul:

 

612-813-6280

651-220-6550

Test Availability:

Daily, 24 hours

Turnaround Time:

4 hours

Special Instructions:

N/A

Specimen

Specimen Type:

Whole blood

Container:

Green top (Li Heparin) tube preferred
Alternate tube: Red top (plain, no gel) tube

Draw Volume:

0.6 mL blood

Processed Volume:

0.2 mL serum/plasma

Collection:

Routine venipuncture. Mix tubes containing anticoagulant by gentle inversion.

Special Processing:

Lab Staff: Centrifuge specimen, remove serum/plasma aliquot into a plastic sample cup. Store at refrigerated temperatures.

Patient Preparation:

None

Sample Rejection:

Mislabeled or unlabeled specimen

Interpretive

Reference Range:

Age:

Range (mg/dL)

0 – 2 days:

3.5 – 9.5 mg/dL

2 days – 1 year:

4.5 – 6.5 mg/dL

1 –-18 years:

4.5 – 5.5 mg/dL

>18 years:

2.7 – 4.5 mg/dL

Critical Values:

<2.0 or >10.0 mg/dL

Limitations:

Phosphorus concentrations may be increased by excess hemolysis.

Methodology:

Phosphomolybdate

References:

PHOS Flex® reagent cartridge insert sheet Siemens Healthcare Diagnostics, Inc. (2008-03-27) 717061.001 – US, Rev L

Jacobs & DeMott Laboratory Test Handbook (2001) Lexi-Comp, Inc, Hudson, OH, 5th Edition

Biorad Liquichek Unassayed Chemistry Control Product Insert Bio-Rad Laboratories, Irvine, CA 92618



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