Phosphorus
Label Mnemonic: PO4
Epic code: LAB113
Downtime form: A-1a Doctor/Provider Orders - Pathology Core and Specialty Care Nursery
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