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Lab Test Dictionary

Quantitative Lymphocyte Subsets: T, B and Natural Killer (NK) (TBBS)


Flow Cytometry


Pediatric Cellular Immune Panel; Infant Cellular Immune Panel

Specimen Type

Whole Blood

Performing Lab

Mayo Medical Lab

Epic ID

Other Reference Test

Lab Test Days


Standard TAT

1-2 Days

Collection Information

Specimen Required

1-3 mL Whole Blood

Container Type

Lavender (EDTA)

Collection Instructions

Draw MONDAY-THURSDAY between 0900-1300 ONLY, no weekends or holidays. Send to lab immediately after collection. Specimens must arrive at Mayo within 24 Hours of collection.

Processing Information - Lab Use Only

Transport Temperature


Specimen Stability

Room Temp: 52 Hours; Refrigerated: Unacceptable; Frozen: Unacceptable

Rejection Criteria

Gross hemolysis; Gross lipemia; ACD or heparin blood; Specimen in aliquot tube

Test Volume Required

3 mL Whole Blood

Minimum Test Volume

1 mL Whole Blood

Included Tests

TBBS: QN Lymphocyte Subsets (T, B and NK (CD45 Total Lymph Count, CD3 (T Cells), CD4 (T Cells); CD8 (T-Cells), CD19 (B-Cells), CD16 CD56 (NK Cells).

CPT Codes

86355, 86357, 86359, 86360