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To view specimen requirements and codes please select your laboratory:

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CBC (includes Differential and Platelets)

Test Code


CPT Code(s)



WBC, RBC, Hemoglobin, Hematocrit, MCV, MCH, MCHC, RDW, Platelet Count, MPV and Differential (Absolute and Percent - Neutrophils, Lymphocytes, Monocytes, Eosinophils, and Basophils)
If abnormal cells are noted on a manual review of the peripheral blood smear or if the automated differential information meets specific criteria, a full manual differential will be performed.

Preferred Specimen(s)

Whole blood from a full EDTA (lavender-top) tube

Minimum Volume

Microtainer 0.5 mL
1 mL whole blood EDTA (lavender-top) tube

Collection Instructions

Maintain specimen at room temperature. Do not refrigerate. If multiple draw, collect EDTA (lavender-top) tube last. Traumatic draw can introduce thromboplastin and trap WBC and platelets. Refrigeration can precipitate fibrin and trap WBC and platelets.

Transport Container

EDTA (lavender-top) tube

Transport Temperature

Room temperature

Specimen Stability

Room temperature: 48 hours
Refrigerated: 48 hours (may cause platelet clumping)
Frozen: Unacceptable

Reject Criteria

Hemolysis • Clotted • Received frozen


Electronic Cell Sizing/Counting/Cytometry/Microscopy

Performing Laboratory

Quest Diagnostics - Southwest Region

Setup Schedule


Reference Range(s)

See Laboratory Report

Clinical Significance

A complete blood count is used as a screening test for various disease states to include: anemia, leukemia and inflammatory processes.

Alternative Name(s)

Complete Blood Count

LOINC®' Code(s)

The Result and LOINC information listed below should not be used for electronic interface maintenance with Quest Diagnostics. Please contact the Quest Diagnostics Connectivity Help Desk for more information at 800-697-9302.

NOTE: The codes listed in the table below are not orderable Test Codes.

Result NameLOINC CodeComponent Name
30000000WHITE BLOOD CELL COUNT6690-2Leukocytes
30000100RED BLOOD CELL COUNT789-8Erythrocytes
30000400MCV787-2Erythrocyte mean corpuscular volume
30000500MCH785-6Erythrocyte mean corpuscular hemoglobin
30000600MCHC786-4Erythrocyte mean corpuscular hemoglobin concentration
30000700RDW788-0Erythrocyte distribution width
30000800PLATELET COUNT777-3Platelets
30000900NEUTROPHILS770-8Neutrophils/100 leukocytes
30001100BAND NEUTROPHILS764-1Neutrophils.band form/100 leukocytes
30001110ABSOLUTE BAND NEUTROPHILS26507-4Neutrophils.band form
30001300METAMYELOCYTES740-1Metamyelocytes/100 leukocytes
30001310ABSOLUTE METAMYELOCYTES30433-7Metamyelocytes
30001500MYELOCYTES749-2Myelocytes/100 leukocytes
30001510ABSOLUTE MYELOCYTES30446-9Myelocytes
30001520PROMYELOCYTES783-1Promyelocytes/100 leukocytes
30001530ABSOLUTE PROMYELOCYTES26523-1Promyelocytes
30001700ABSOLUTE NEUTROPHILS751-8Neutrophils
30001800LYMPHOCYTES736-9Lymphocytes/100 leukocytes
30002000REACTIVE LYMPHOCYTES13046-8Lymphocytes.variant/100 leukocytes
30002110ABSOLUTE LYMPHOCYTES731-0Lymphocytes
30002200MONOCYTES5905-5Monocytes/100 leukocytes
30002400ABSOLUTE MONOCYTES742-7Monocytes
30002500EOSINOPHILS713-8Eosinophils/100 leukocytes
30002700ABSOLUTE EOSINOPHILS711-2Eosinophils
30002800BASOPHILS706-2Basophils/100 leukocytes
30003000ABSOLUTE BASOPHILS704-7Basophils
30003400BLASTS709-6Blasts/100 leukocytes
30003500ABSOLUTE BLASTS30376-8Blasts
30003600NUCLEATED RBC19048-8Erythrocytes.nucleated/100 leukocytes
30003610ABSOLUTE NUCLEATED RBC30392-5Erythrocytes.nucleated
30004200COMMENT(S)8251-1Service comment
30004600MPV776-5Platelet mean volume

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

LOINC assignment is based on a combination of test attributes, including the method used by the performing laboratory. For tests not performed by Quest Diagnostics, codes are assigned by the performing laboratory.

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.