Sign In
Labcorp Oklahoma, Inc.
Test Directory


Manual Differential

Order Name DF
Test Number: 0101510
Revision Date 01/06/2023
Test Name Methodology LOINC Code
Manual Differential
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 5 mL (1 mL) Whole Blood EDTA (Lavender Top) Refrigerated
Alternate 1 2 Slides (1 Slide) Whole Blood EDTA (Lavender) Microtainer/Bullet Refrigerated
Alternate 2 2 Slides (1 Slide) Peripheral Blood Smears Glass Slides with Holder Room Temperature
Instructions For best results
Send a fresh, unstained blood smear. Otherwise, whole blood specimen should be sent as soon as possible to the lab so that smear can be made within 24 hours of collection.
Testing Schedule Daily 
Expected TAT 1 Day  
Clinical Use The white blood cell count is useful in the diagnosis and management of infection, inflammatory disorders, hematopoietic maligancies, evaluation of myelopoietic disorders, drug effects, and response to various cytotoxic agents. The differential count is performed to acquirefurther information concerning the above states and enables one to arrive at values for the bsolute value of discreet WBC population. Absolute values for individual cell populations are obtained froma combination of the WBC count and the % of each cell type from the differential. 
Notes Microscopic examination includes enumeration of white blood cell populations and cellular morphology.
CPT Code(s) 85007
Lab Section Hematology