White Blood Cell Differential and Total WBC Count

White Blood Cell Differential and Total WBC Count

CPT Test code: 85004;85048

Test Includes: Total WBC plus relative (%) and absolute counts of all white blood cell types
Specimen: Whole blood
Volume: Tube fill capacity
Minimum Volume: 0.5 mL
Container: Lavender-top (EDTA) tube
Collection: Invert tube 8 to 10 times immediately after tube is filled at the time of collection.
Storage Instructions: Maintain specimen at room temperature for 24 hours; refrigerate for 48 hours.
Causes for Rejection: Hemolysis; clotted specimen; tube not filled with minimum fill volume; specimen diluted or contaminated with IV fluid; specimen drawn in any anticoagulant other than EDTA; transfer tubes with whole specimen received with plasma removed (plasma used for other testing); improper labeling; samples more than 72 hours old.
Use: Determine quantitative variations in white cell numbers and types