Additional Testing Requirements

This assay is useful for evaluating thymic output, and for longitudinal assessment of thymic function.

For comprehensive assessment of thymic function in pediatric patients and/or individuals who have received hematopoietic stem cell transplantation, order this test together with CD4RT / CD4 T-Cell Recent Thymic Emigrants, Blood.

Shipping Instructions

Specimens must be received in the laboratory on weekdays and by 4 p.m. on Friday. Collect and package specimen as close to shipping time as possible.

It is recommended that specimens arrive within 24 hours of collection.

Samples arriving over the weekend or on observed holidays may be canceled.

Necessary Information

Ordering physician's name and phone number are required.

TREC Assay Patient Information (T589) is required. Testing will proceed without the form; however, results will be held under the information is received.

Specimen Required

For serial monitoring, it is recommended to perform specimen collection at the same time of day, if possible.

Supplies: Ambient Shipping Box-Critical Specimens Only (T668)

Container/Tube: Lavender top (EDTA)

Specimen Volume:

Adults: 10 mL

Pediatrics

-Preferred volume for >1 year: 5 mL

-Preferred volume for ≤1 year old: 3 mL

Collection Instructions:

1. Do not collect specimen using a butterfly needle.

2. Send whole blood specimen in original tube. Do not aliquot.