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Test Name

Natural Killer Cells, Functional

CPT Code(s)

88184, 88185 (x2)

Methodology

Flow Cytometry (FC)

Reference Range(s)

Decreased Activity <7 LU30
Normal Activity 7-125 LU30
Increased Activity >125 LU30

Clinical Significance

Natural killer cells (NK cells) are a subset of non-B, non-T peripheral blood lymphocytes that appear to play a crucial role in the human innate immune response. The function of NK cells is important for the clearance of tumor cells, for the removal of immunoglobulin-bound antigens, and for the control of viral infections. NK function has been reported to be decreased in certain individuals, including those with primary immunodeficiencies, those with late-stage human immunodeficiency virus infections, and pregnant women.

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Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.

34184X
34184
34184
34184
34184
34184X
34184
34184X
34184X
152120
34184
34184
34184
34184
34184
34184
34184
34184
34184
34184
34184X
34184
34184
34184X
137080
34184
34184
34184
Natural Killer Cells, Functional
34184