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Lab Test Dictionary

Lymphocyte Subset Panel 2 (36420)


Flow Cytometry (FC)

Specimen Type

Whole Blood

Performing Lab

Quest Diagnostics San Juan Capistrano

Epic ID


Lab Test Days


Standard TAT

2-3 Day

Collection Information

Specimen Required

0.5-5 mL Whole Blood

Container Type

Lavender (EDTA)

Collection Instructions

Volumes below 1 mL should be submitted in a pediatric EDTA (lavender-top) tube.

Processing Information - Lab Use Only

Transport Temperature


Specimen Stability

Room Temp: 72 Hours; Refrigerated: Unacceptable; Frozen: Unacceptable

Rejection Criteria

Hemolysis; Lithium heparin (green-top) tube; ACD (yellow-top) tube; Clotted

Test Volume Required

5 mL Whole Blood

Minimum Test Volume

0.5 mL Whole Blood

Processing Instructions

ALL specimens for this test need to be packaged and submitted to Quest in a Hematopathology Specimen Transport box.

Included Tests

% CD3 (Mature T Cells), Absolute CD3+ Cells, % CD4, Absolute CD4+ Cells, % CD8, Absolute CD8+ Cells, CD4/CD8 Ratio, % CD19 (B Cells), Absolute CD19+ Cells and Absolute Lymphocytes.

CPT Codes

86355, 86359, 86360