Test name: Phosphorus
Order Code: PHOS
Preferred Specimen: 2mL serum in a Serum Separator Tube (SST or Tiger-top)
CPT Code: 84100
Collection: Allow SST to clot in an upright position for 30 min, then centrifuge sample within 2 hours of collection. Refrigerate.
Special Instructions and Considerations: Phospholipids contained in liposomal drug formulations (eg AmBisome) may be hydrolyzed in the test due to the acidic reaction pH and thus lead to elevated phosphate results.
Transport Temperature: Refrgierated
Specimen Stability: 24 hours under room temperature; 4 days refrigerated
Causes for Rejection: Moderate or Greater Hemolysis