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Test Code BLOD0636 White Blood Cell (WBC) Count, Blood

Useful For

  • A screening test for conditions such as such as infection, inflammation, or a disease that affects the production or survival of WBCs
  • To monitor treatment of a blood disorder
  • To monitor therapy known to affect WBCs



Performing Laboratory

Bozeman Health Laboratory Services

Specimen Requirements

Specimen Type: Whole blood

Container/Tube: Lavender top (EDTA) or lavender top (EDTA) Microtainer

Specimen Volume: 4 mL

Pediatric Volume: 1 full Microtainer

Collection Instructions: If there is a delay in transport of >24 hours, refrigerate specimen and send specimen refrigerated.

Specimen Rejection: Unrefrigerated specimen> 24 hours old. Refrigerated specimen >48 hours old.

Specimen Transport Temperature

Ambient <24 hours/Refrigerated <48 hours

Specimen Stability

Specimen Type Temperature Time
Whole blood (EDTA) Ambient 24 hours
  Refrigerated 48 hours


Reference Values


Component Age Break Normal Range Critical Values
WBC ≥ 18 years 3.2 - 10.8 K/uL >29.9 K/uL


Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding