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Test Code PHOS Phosphorus

Useful For

Measurements of phosphorus (inorganic) are used in the diagnosis and treatment of various disorders, including: parathyroid gland and kidney diseases, and vitamin D imbalance.

Synonyms/Keywords

PO4, Inorganic Phosphorus, Phos, Phosphate

Specimen Requirements

Fasting Required Specimen Type
 		 Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
No Plasma/Serum Lithium-heparin Plasma Separator (PST), Serum Separator Tube (SST) Lithium or Sodium-heparin Green Top (GTT), Red Top Tube (RTT) 1 mL 0.3 mL 0.4 mL whole blood

Specimen Stability Information

Specimen Type Temperature Time
Plasma/Serum Ambient 8 hours
Refrigerate 2 days
Frozen 2 months

Rejection Criteria

Hemolyzed samples
Samples collected with Potassium oxalate/sodium fluoride and EDTA

Interferences

Phosphorus may be falsely increased due to hemolysis.

Reference Range Information

Performing Location Reference Range
All Sites 

Male and Female:
0-3 months:    3.0 - 7.2 mg/dL
4-12 months:   3.1 - 6.7 mg/dL
≥ 18 years:   2.2 - 4.5 mg/dL

 

Female: 
13 - 24 months:   3.1 - 6.3 mg/dL
25 mo. - 12 yrs:   3.1 - 5.9 mg/dL
13 - 14 years:   3.1 - 5.5 mg/dL
15 - 17 years:   3.1 - 4.8 mg/dL

 

Male:
13 - 24 months:   3.1 - 6.2 mg/dL
25 mo. - 12 yrs:   3.1 - 5.9 mg/dL
13 - 17 years:   3.1 - 5.3 mg/dL

 

See Critical Value List for list of current critical values
 

 

Marshfield Labs Performing Department

Marshfield Labs Chemistry

Performing Information

Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Beaver Dam Monday through Sunday Less than 2 hours Phosphomolybdate Complex Endpoint Assay/Beckman AU
Weston Monday through Sunday Less than 2 hours Phosphomolybdate Complex Endpoint Assay/Beckman AU
Eau Claire Monday through Sunday Less than 2 hours Phosphomolybdate Complex Endpoint Assay/Beckman AU
Park Falls Monday through Sunday Less than 2 hours Phosphomolybdate Complex Endpoint Assay/Beckman AU
Ladysmith  Monday through Sunday Less than 2 hours Phosphomolybdate Complex Endpoint Assay/Beckman AU
Rice Lake Monday through Sunday Less than 2 hours Phosphomolybdate Complex Endpoint Assay/Beckman AU
Marshfield Monday through Sunday Less than 2 hours Phosphomolybdate Complex Endpoint Assay/Beckman AU
Minocqua Monday through Sunday Less than 2 hours Phosphomolybdate Complex Endpoint Assay/Beckman AU
Neillsville Monday through Sunday Less than 2 hours Phosphomolybdate Complex Endpoint Assay/Beckman AU 
Stevens Point Monday through Friday Less than 2 hours Phosphomolybdate Complex Endpoint Assay/Beckman AU
Wisconsin Rapids Monday through Friday Less than 2 hours Phosphomolybdate Complex Endpoint Assay/Beckman AU

CPT Codes

CPT Modifier
(if needed)		 Quantity Description Comments
84100   1    

Outreach CPT Codes

CPT Modifier
(if needed)		 Quantity Description Comments
84100   1    

Ordering Applications

Ordering Application Description
Cerner Phosphorus Level