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Test Code HERGN HER2, Gastric/Esophageal, Semi-Quantitative Immunohistochemistry, Manual, No Reflex

Advisory Information

If being ordered for diagnostic purposes: order PATHC / Pathology Consultation and then request the stains.


For breast cancer specimens, order HERBA / HER2, Breast, Quantitative Immunohistochemistry, Automated with HER2 FISH Reflex or HERBN / HER2, Breast, Quantitative Immunohistochemistry, Automated, No Reflex.

Shipping Instructions

Attach the green pathology address label included in the kit to the outside of the transport container.

Necessary Information

Include accompanying pathology report stating the final diagnosis. If not available, a preliminary diagnosis is acceptable only if it refers to invasive or metastatic gastric or esophageal adenocarcinoma.

Specimen Required

Only paraffin-embedded (FFPE) gastric or esophageal adenocarcinoma specimens will be accepted. Fixation in 10% neutral-buffered formalin is preferred. The performance and quality of immunohistochemical stains in 10% neutral buffered FFPE tissue depends on proper fixation. It is recommended (not required) for surgical specimens to be fixed between 18 and 24 hours and biopsy specimens between 6 and 8 hours.


If being ordered for prognostic purposes:

Specimen Type:

Supplies: Pathology Packaging Kit (T554)

Preferred: Paraffin-embedded tissue block containing invasive gastric or esophageal adenocarcinoma tissue

Collection Instructions: Tissue must have been fixed in 10% neutral-buffered formalin shipped at ambient temperature.


Acceptable: Slides

Specimen Volume: 5

Collection Instructions:

1. 5 unstained sections, containing gastric or esophageal adenocarcinoma, on charged slides cut at 4 microns <1 month ago and shipped at ambient temperature.

2. Tissue on the slides should be fixed in 10% neutral-buffered formalin.

Additional Information: Paraffin blocks will be returned with final report.


If not ordering electronically, complete, print, and send 1 of the following forms with the specimen:

Pathology Test Request Form (T246) (

Oncology Test Request Form (T729) (

Immunohistochemical (IHC)/In Situ Hybridization (ISH) Stains Request Form (T763) (

Useful For

Determining overexpression of HER2 protein of gastric and esophageal adenocarcinoma in formalin-fixed, paraffin-embedded tissue sections (no reflex to FISH testing)

Method Name

Ventana Pathway Immunoperoxidase Stain with Manual Semi-Quantitative Immunohistochemistry

Reporting Name

HER Gastric/Esoph IHC NO Reflex

Specimen Type


Specimen Stability Information

Specimen Type Temperature Time
Special Ambient (preferred)

Reject Due To









Reference Values

Reported as negative (0, 1+), equivocal (2+), and positive (3+)

Day(s) and Time(s) Performed

Monday through Friday

Analytic Time

2 days

Performing Laboratory

Mayo Medical Laboratories in Rochester

Test Classification

This test has been cleared or approved by the U.S. Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
HERGN HER Gastric/Esoph IHC NO Reflex In Process


Result ID Test Result Name Result LOINC Value
70990 Interpretation 50595-8
70991 Participated in the Interpretation No LOINC Needed
70992 Report electronically signed by In Process
70994 Material Received 81178-6
MA021 Tumor classification In Process
71626 Disclaimer 62364-5
71840 Case Number In Process