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Lab Test Dictionary

X-Linked Hyper IgM Syndrome, Blood (XHIM)


Flow Cytometry


CD154; CD40 Activation; CD40 Ligand; Memory Cells; T cell Activation; IgM (Immunoglobulin)

Specimen Type

Whole Blood

Performing Lab

Mayo Medical Lab

Epic ID

Other Reference Test

Lab Test Days


Standard TAT

3-4 Days

Collection Information

Specimen Required

1.2-4 mL Whole Blood

Container Type

Dark Green (Sodium Heparin)

Collection Instructions

Collect Monday-Thursday only, no weekends or holidays.

Processing Information - Lab Use Only

Transport Temperature


Specimen Stability

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

Rejection Criteria

Gross hemolysis; Gross lipemia; Lithium heparin

Test Volume Required

4 mL Whole Blood

Minimum Test Volume

1.2 mL Whole Blood


Insurance authorization is required prior to draw for outpatients. Ok to send on inpatients.

CPT Codes

88184, 88185 (x6)