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Test Name

Test ID: 


CPT code:

85048, 85004


•Leukocyte/WBC Count, Peripheral Blood
•WBC With Diff, Total and Differential
•White Blood Cell Morphology

Clinical Use:

Determine quantitative variations in white cell numbers and types

Specimen Type:

Whole blood

Requested Volume: 

Tube fill capacity

Minimum Volume: 

0.5 mL (500 μL for pediatric microtainer capillary tubes; fill tube to capacity.)

Container Type: 

Lavender-top (EDTA) tube


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.

Stability Requirements:



Room temperature

1 day


3 days



Freeze/thaw cycles


Rejection Criteria:

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.

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