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Lab Test Dictionary

T-Cell Receptor Excision Circles (TREC) Analysis, Blood (TRECS)


Real-Time Quantitative Polymerase Chain Reaction (PCR)

Specimen Type

Whole Blood

Performing Lab

Mayo MedIcal Lab

Epic ID

Other Reference Test

Lab Test Days


Standard TAT

5-7 Days

Collection Information

Specimen Required

3-10 mL Whole Blood (1 mL Whole Blood for Infants)

Container Type

Lavender (EDTA)

Collection Instructions

Avoid hemolysis. Collect Monday-Thursday between 0800-1300 only, for next day delivery. Specimen need to arrive at Mayo within 24 Hours of collection. Must complete Mayo's TREC Assay Patient Information form and submit with specimen.

Processing Information - Lab Use Only

Transport Temperature


Specimen Stability

Room Temp: 48 Hours; Refrigerated: Unacceptable; Frozen: Unacceptable

Rejection Criteria

Gross hemolysis; Gross lipemia

Test Volume Required

10 mL Whole Blood

Minimum Test Volume

3 mL Whole Blood (1mLWhole Blood for Infants)

Processing Instructions

Send Monday-Thursday only, no weekends or holidays. Specimen needs to arrive at Mayo within 24 Hours of collection. Must include Mayo's TREC Assay Patient Information form completed by the physican. Order in Mayolink. Mayo courier will picks up Monday-Friday.


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

CPT Codes