WBC Differential Count
| Abbrev Code: | WDIFF | ||
| Order Code: | LAB3880 | Order 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
| Specimen: | Blood |
| 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) |
Interpretive
| 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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