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HelpTest Code 22C3 Programmed Death-Ligand 1 (PD-L1) (22C3), Semi-Quantitative Immunohistochemistry, Manual
Ordering Guidance
In patients with specific tumor types, programmed death-ligand 1 (PD-L1) immunohistochemistry (IHC) is indicated to predict response to treatment with PD-L1 inhibitors. The specific PD-L1 clone, scoring method, and eligibility requirements depend on the tumor type, stage of malignancy, previous treatment outcomes, and specific PD-L1 inhibitor under consideration. For assistance with PD-L1 test selection as well as answers to frequently asked questions, see PD-L1 Immunohistochemistry Testing on MayoClinicLabs.com.
Shipping Instructions
Attach the green pathology address label included in the kit to the outside of the transport container.
Necessary Information
A pathology/diagnostic report and a brief history, including primary site of neoplasm, are required.
Specimen Required
Specimen Type: Tissue
Supplies: Pathology Packaging Kit (T554)
Collection Instructions: Formalin-fixed, paraffin-embedded tissue block; or 3 unstained glass, "positively charged" slides with 4-microns formalin-fixed, paraffin-embedded tissue
Additional Information: One slide will be stained with hematoxylin and eosin and returned.
Useful For
Identification of neoplasms expressing programmed cell death 1-ligand 1 (clone 22C3)
Reporting Name
PD-L1 (22C3) SemiQuant IHC, ManualSpecimen Type
SpecialSpecimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Special | Ambient (preferred) | ||
| Refrigerated | |||
Reject Due To
| Decalcified bone Wet/frozen tissue Cytology smears Nonformalin fixed tissue including alcohol-formalin-acetic acid (AFA), 95% ethanol, PREFER fixatives or Zinc formalin Nonparaffin embedded tissue Noncharged slides ProbeOn slides |
Reject |
Day(s) Performed
Monday through Friday
Report Available
5 to 7 daysSpecimen Retention Time
Until reportedPerforming Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
88360
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| 22C3 | PD-L1 (22C3) SemiQuant IHC, Manual | 85147-7 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 603763 | Interpretation | 59465-5 |
| 603764 | Participated in the Interpretation | No LOINC Needed |
| 603765 | Report electronically signed by | 19139-5 |
| 603766 | Material Received | 81178-6 |
| 603767 | Disclaimer | 62364-5 |
| 603768 | Case Number | 80398-1 |
Forms
If not ordering electronically, complete, print, and send 1 of the following forms with the specimen:
Immunohistochemical (IHC)/In Situ Hybridization (ISH) Stains Request (T763)
Oncology Test Request (T729)