Phosphorus
Label Mnemonic: PO4
Epic Lab Code: LAB113
Downtime Form: A-1a General Laboratory Requisition
Chemistry
6240 RCP
356-3527
Specimen(s):
Plasma
Collection Medium:
Plasma Separator Tube 4.5 mL
Alternate Collection Media:
Call laboratory for additional acceptable specimen collection containers.
Minimum:
3 mL whole blood from light green top tube or ONE Microtainer® for pediatric patients.
Testing Schedule:
24 hrs/day, 7 days a week, including holidays.
Turn Around Time:
1 hour (upon receipt in laboratory)
Reference Range:
Reference ranges based on package insert (Roche Diagnostics PHOS2 ver. 2) Age Male (mg/dL) Female (mg/dL) 0-30 days 3.9-6.9 4.3-7.7 1-12 months 3.5-6.6 3.7-6.5 1-3 years 3.1-6.0 3.4-6.0 4-6 3.3-5.6 3.2-5.5 7-9 3.0-5.4 3.1-5.5 10-12 3.2-5.7 3.3-5.3 13-15 2.9-5.1 2.8-4.8 16-18 2.7-4.9 2.5-4.8 >18 2.5-4.5 2.5-4.5 Reference ranges updated 10/13/2015.
Comments:
Refer to BD Microtainer® Tubes product sheet for detailed sample collection instructions.

This test is also performed in the Iowa River Landing (IRL) clinical laboratory (for specimens drawn at that site).
Test Limitations:
Criterion: Recovery within plus or minus 10% of initial value. Plasma Icterus: No significant interference up to an I index of 60. Hemolysis: Significant positive interference at an H index greater than 300 (approximate hemoglobin concentration: 300 mg/dL). NOTE: This interference results from inorganic phosphates produced by the action of phosphatases on organic phosphates, both of which are released from the red cell upon hemolysis (2). Lipemia (Intralipid): No significant interference up to an L index of 800. There is poor correlation between turbidity and triglycerides concentration. Drugs: No interference was found at therapeutic concentrations using common drug panels.
Methodology:
Molybdate UV
CPT Code:
84100
 
See also:
Phosphorus-Other, Body Fluid