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HelpTest Code HNK1 HNK1 (CD57) Panel, Blood
Additional Codes
St. Luke's Compendium (Iatric) Code: L700.9760
Performing Laboratory
LabCorp
Methodology
Flow Cytometry
Specimen Requirements
Both sample types must be submitted or the test will be rejected.
Whole Blood
Lavender-top (EDTA) and yellow-top (ACD A) or (ACD B) tubes filled to capacity. Invert tubes 8 to 10 times immediately after collection. To preserve cellular viability, collect specimen so it will arrive to Lab Corp within 48 hours of draw. Do not collect on Friday, Saturday, or Sunday. Specimen should be forwarded to the laboratory at room temperature, do not refrigerate or freeze.
Causes for Rejection
Specimens that are refrigerated, frozen, clotted, or hemolyzed will be rejected.
Reference Values
%CD8-CD57+ Llymphocytes: 2.0-17.0%
Absolute CD8-CD57+ Lymphocytes: 60-360/uL
Day(s) Test Set Up
Monday-Thursday
Test Classification and CPT Coding
CPT- 86356: Mononuclear cell antigen, quantitative (eg. flow cytometry), not otherwise specified, each antigen.
CPT-86357: Natural killer (NK) cells, total count
Intended Use
This test is used to monitor the CD57 lymphocyte subset in patients with chronic Lyme disease.
Limitations of the Procedure
Results for this test are for investigational purpses only by the assay's manufacturer. The performance characteristics of this product have not been established. Results should not be used as a diagnostic procedure without confirmation of the diagnosis by another medically established diagnostic product or procedure.