Days Set Up
Tuesday, Thursday (specimen must be received by lab no later than 9:00 am to be included in that day's run)
Analytic Time

Test Updated:


PD-L1 IHC Stain
PDL-1 IHC Stain
PDL1 IHC Stain
PD1 IHC Stain
PD-1 IHC Stain
PD-L1 Keytruda (lung)
PD-L1 by Immunohistochemistry 22C3 Antibody (PDL1K)

Looking to order a test?

We’ve provided helpful links to make ordering easy.

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

Immunohistochemistry (IHC)

Test Usage
Reference Range

Negative (no expression). Interpretive report provided.

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

Specimen Requirements

Collection Offsite

Formalin-fixed, paraffin-embedded tissue block; or 3 unstained glass, "positively charged" slides with 4-microns formalin-fixed, paraffin-embedded tissue. Slides must be dried before shipping (air dry overnight or dry in 60 degree C oven for 20 minutes). Both blocks and slides should be stored at room temperature.

Normal Volume
Formalin-fixed, paraffin-embedded tissue or unstained slides.
Minimum Volume

Billing Information

CPT Code
Pro Fee Code

Have More Questions?

Explore our helpful billing resources:

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.