Days Set Up
Monday - Friday
Analytic Time

3 days

MiChart Code
NK Function (Sendout)
Soft Order Code

Test Updated:


Natural Killer Cell Activity
NK cell Functional
NK cell
Natural Killer Cell Functional Assay
NK Function

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Find a Requisition

All specimens should be accompanied by a requisition.

Submitting Specimens

Learn about how to properly label and where to ship specimens.

Order Kits and Supplies

MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

Visit our provider FAQ and learn about common questions to ordering tests.

Test Overview

Test Methodology

Chromium Release

Test Usage

Natural Killer (NK) cells, a component of the cell-mediated arm of the immune system, mediate destruction of some types of tumor cells and virus-infected cells. Decreased NK cytotoxicity is associated with impaired immune surveillance, and may explain a predisposition to malignancy and viral infections. Increased NK cytotoxicity has been observed in women with a history of spontaneous abortions.

Reference Range

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements


Specimen must be collected between 12 noon and 4pm to arrive in Cincinnati within stability. Collect sufficient specimens in green top tubes. Send intact whole blood at room temperature. Do not refrigerate or freeze. Specimens are accepted by MLabs Monday through Thursday between 12:00 noon and 4:00 pm only and must be received by performing laboratory within 24 hours of collection.

Normal Volume
10 mL heparinized whole blood
Minimum Volume
10 mL heparinized whole blood

Billing Information

CPT Code
86352, 86357
Pro Fee Code

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.