Site-Specific Factor 8

HER2: Immunohistochemistry (IHC) Lab Value


**Note 1:** Record the results of only the immunohistochemistry (IHC) lab value for Human Epidermal Growth Factor Receptor 2 (HER2) in this field. The test determines if there is HER2 overexpression, or an excess amount of HER2 protein on the cell surface. The score is assigned by the pathologist based on the percentage and intensity of cell membrane staining. **Note 2:** The same laboratory test should be used to record information in **Site-Specific Factor 8, HER2: Immunohistochemistry (IHC) Lab Value** and **Site-Specific Factor 9, Immunohistochemistry (IHC) Test Interpretation**. **Note 3:** If the test is done but the actual score is not stated, code 997. **Note 4:** If the test is not mentioned in the medical record, code to 999 unless there are circumstances under which the test isn't performed, for example, no histologic specimen.




NAACCR #2862


Code Description
000 Score 0
010 Score of 1+
020 Score of 2+
030 Score of 3+
988 Not applicable: Information not collected for this case
997 Test ordered, results not in chart
998 Test not done (test not ordered and not performed)
999 Unknown or no information
Not documented in patient record