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Specimen Collection Manual and Test Catalog

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PHOSPHORUS

Geisinger Epic Procedure Code:  LAB2846    Geisinger Epic ID:  14398

SPECIMEN COLLECTION
Specimen type: 

Plasma or serum


Preferred collection container: 
Specimen required: 

2 mL of serum or plasma; minimum 0.2 mL.



SPECIMEN PROCESSING
Processing instructions: 

Allow serum to clot. Centrifuge to separate serum or plasma within 2 hours of collection.


Transport temperature: 

Refrigerated (preferred). Room temperature or frozen specimen also acceptable.


Specimen stability: 

Spun SST: Room temperature: 24 hours. Refrigerated: 4 days. Frozen: 1 year. Spun PST: 12 hours.


Rejection criteria: 

Stability limits exceeded.



TEST DETAILS
Reference interval: 

Less than 30 days: 3.9-7.7 mg/dL 
30 days to 1 year: 3.5-6.6 mg/dL 
1 to <4 years: 3.1-6.0 mg/dL 
4 to <13 years: 3.0-5.7 mg/dL 
13 years and older: 2.5-4.8 mg/dL


CPT code(s):  84100
Note: The billing party has sole responsibility for CPT coding.  Any questions regarding coding should be directed to the payer being billed.
The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only.

Methodology: 
Spectrophotometric (Colorimetric)
Synonyms: 

Phosphate, Inorganic Phosphorus, PO4, PHOS


Clinical significance: 

An increased phosphorus with a decreased calcium suggests either hypoparathyroidism or renal disease. A decreased phosphorus and an increased calcium suggests hyperparathyroidism or sarcoidosis. 

Decreased phosphorus and calcium may indicate malabsorption, vitamin D deficiency and renal tubular acidosis. Increased phosphorus and calcium suggest milk-alkali syndrome or hypervitaminosis D.


Doctoral Director(s): 
Hoi-Ying Elsie Yu, PhD, DABCC, FADLM
Sheng-Ying (Margaret) Lo, PhD, DABCC
Review Date:  12/27/2024

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