Laboratory Test Information Guide

Details for Phosphate, Plasma

Test Name: Phosphate, Plasma
Alternate Name(s): Inorganic Phosphate
Inorganic Phosphorus, PO4
Laboratory: Core
Specimen Type: 4.5 mL Green top Vacutainer
0-2 years: 0.5 mL Green top Microtainer
2-10 years: 3 mL Green top tube
Collection Information: Collect blood aseptically in a Vacutainer tube.

Fasting sample preferred because levels tend to fall post prandially.

The minimum volume required for pediatric samples is 0.2 mL.
Test Schedule: As required
Turnaround time from when specimen
is received in testing laboratory:
4 hours
1 hour
Reference Range: < 1 year
01.30-2.60 mmol/L
1 year - 4 years
1.16-2.10 mmol/L
4 years - 14 years
1.10-1.90 mmol/L
> 14 years
0.80-1.33 mmol/L
Effective Date: 2008-11-15
Revised Date: 2014-02-25
Critical Value:  
Interpretive Comments: Useful in the diagnosis and management of a variety of disorders including bone, parathyroid and renal disease. Phosphate levels alone are of limited diagnostic value and should be correlated with serum calcium levels.

Serum phosphate concentrations are dependent on meals and hormone regulation (PTH, vitamin D).

Common causes of hypophosphatemia are: shift of phosphate from extracellular to intracellular, renal phosphate wasting, loss from the gastrointestinal tract, and loss from intracellular stores.

Hyperphosphatemia occurs in renal failure secondary to an inability of the kidneys to excrete phosphate. Other factors may relate to increased phosphate or viatmin D intake.
Special Processing:  
Comments: Hemolysis may affect results.

In very rare cases gammopathy, in particular type IgM (Waldenstrom's macroblobulinemia) may cause unreliable results.
Method of Analysis: Endpoint photometric, Ammonium Molybdate
Critical Information Required:  
Storage & Shipment:  
System Codes: 
Referred To:  

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