Jun 14, 2017




Clinical Hub,Tools & Resources,UWHC Lab Test Directory,Molecular Diagnostics

STR Engraftment Separated Lineages

STR Engraftment Separated Lineages (HCSTRSEP) Molecular Diagnostics Lab Test

Name: STR Engraftment Separated Lineages

Test Name: STR Engraftment Separated Lineages

Health Link Test Code: HCSTRSEP


CPT Code(s): 81268x2

Test Component:

STR Engraftment Population 1 (CD3+) and STR Engraftment Population 2 (CD33+).  Both tests must be ordered at same time and should NOT be ordered individually.

Methodology: PCR

Clinical Information:

Typically used to assess proportions of donor- and recipient-derived CD3+ and CD33+ cells post stem cell transplant or in cases of suspected graft-vs-host disease.

Days Performed: Wed.

In-Lab Turnaround Time: 10 days.

Specimen: Blood

Collection Container: Lavender top

Collection Instructions:

Specific sub-populations of white blood cells may be submitted for analysis. If separated by an outside lab, please identify the population on the label.


Specimens must be received by the UWHC Molecular Diagnostics Lab no later than noon on Fridays or the day before a holiday in order to be processed in a timely manner. Specimens will not remain stable for more than 24 hours.

Collection Volume: 8 mL

Pediatric Collection Volume: 2 mL

Stability Ambient:

24 hours

Stability Refridgerated:

Not acceptable

Stability Frozen:

Not acceptable

Specimen Transport:

Transport specimen to laboratory.


Sensitivity of detection of donor(s) in recipient is assessed for each combination of donor(s)/recipient.


 > 95-98% Donor  Predominantly Donor
 < 2-5% Donor  Predominantly Recipient
 2-98%, 5-95% Donor  Donor/Recipient Chimeric

Interpretation Type: Interpretive Guidelines

Additional Information:

The specimen collected is processed by the UWHC Molecular Diagnostics Laboratory to extract CD3+ and CD33+ cell lineages. Each lineage is tested separately to quantitate and report independently the percentages of donor-derived cells. Test requires pre-transplant DNA samples on file in the laboratory for recipient and donor.


The performance characteristics of this test were validated by UWHC Clinical Laboratories. The U.S. Food and Drug Administration (FDA) has not approved or cleared this test; however, FDA approval or clearance is currently not required for clinical use of this test. The results are not intended to be used as the sole means for clinical diagnosis or patient management decisions. The UWHC Clinical Laboratories is authorized under Clinical Laboratory Improvement Amendments (CLIA) to perform high-complexity testing.