CD57 + NK Cells, Peripheral Blood by Flow Cytometry

Sunquest Code:CD57NK  
Epic Code:LAB6492Epic Name:CD57 + NK Cells
Methodology:Flow cytometry
Turnaround Time:Specimens are sent to reference laboratory Mon-Sat; results are reported within 1-3 days.
Special Instructions:Specimens must be assayed within 72 hours of collection.

Analyte Specific Reagent. This test was developed and its performance characteristics determined by ARUP Laboratories. The U. S. Food and Drug Administration has not approved or cleared this test; however, the FDA has determined that such clearance or approval is not necessary.

Collection Instructions

Optimal Volume:4 mL
Minimum\Peds Volume:0.5 mL
Container:Purple (EDTA) (Green (sodium heparin, no gel))
Causes for Rejection:Samples greater than 72 hours old. Clotted or hemolyzed specimens.

Processing and Shipping

Specimen Processing:Whole blood. Do not process.
Shipping Instructions:Ship original container at room or refrigerated temperatures.
Stability:Stability: Samples are stable at room or refrigerated temperature for 72 hours.
Test Performed at or Referral Lab Lab Sendouts  (ARUP)
Referral Lab number:2008912


Reference Range:

Percent CD57+CD3- (NK Cells)

1-16 percent of lymph

Abs CD57+CD3- (NK Cells)

21-357 cells/uL



Use:This test identifies and quantifies the CD57+/CD3-NK cells. The significant of low CD57+NK values in diagnosing and monitoring chronic Lyme disease is not well established and should be used in conjunction with other diagnostic tests specified in the Centers for Disease Control Lyme Disease case definition.

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