WBC Differential Count

Abbrev Code:WDIFF   
Order Code:LAB3880Order Name:Differential
Order Instructions:Must be ordered with WBC (LAB299) or CBC (LAB294)
Synonyms:Differential Leukocyte Count; Leukocyte Differential Count
CPT Codes: 85004 x1
Test Includes:Relative frequency (%) and absolute value of the white blood cells. Test may include manual leukocyte differential, RBC morphology and/or PLT evaluation if reflex criteria is met.
Turnaround Time:Performed and reported 24 hours/day.
Special Instructions:A WBC must be ordered with every differential.

Collection Instructions

Optimal Volume:2-3 mL EDTA tube or 0.5 mL in an EDTA microtainer (do not fill more than 0.5 mL)
Minimum\Peds Volume:1.0 mL EDTA tube or 0.3 mL in an EDTA microtainer
Container:Purple (EDTA)
Collection Instructions:Immediately mix specimen 10 times by gentle inversion.
Causes for Rejection:Clotted, frozen, or centrifuged specimens.
Additionally, certain parameter(s) may also be rejected due to platelet clumping, fibrin strands, cold agglutinins, hemolysis, icterus, and/or lipemia.

Processing and Shipping

Specimen Processing:Store in refrigerator.
Shipping Instructions:Ship at refrigerated temperature. 
Stability:24 hours room temperature; 48 hours refrigerated; do not freeze. 
If more than 24 hours is required for transport, 2 unstained whole blood smears must accompany whole blood EDTA specimen.
Test Performed at or Referral Lab Hematology  (Clinics, CSC Maple Grove, CSC Mpls, Grand Itasca, Lakes, Northland, Range, Ridges, Southdale, St. John's, UMMC East Bank, UMMC/UMMCH-West Bank, Woodwinds)


Critical Range:Hematology Critical Values and Reference Ranges
Reference Range:Hematology Critical Values and Reference Ranges
Use:Evaluate and monitor hematologic disorders and drug, radiation, bone marrow transplant therapy; with WBC count, calculate absolute numbers of leukocyte types; help distinguish bacterial and viral infections.

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