Breast

Note 1: The summary of the results of the Immunohistochemistry (IHC), Fluorescent In Situ Hybridization (FISH), Chromogenic In Situ Hybridization (CISH), or other/unknown Human Epidermal Growth Factor Receptor 2 (HER2) test is recorded here. This variable is based on CS Site-Specific Factors 9, 11, 13, and 14.
Note 2: If both an IHC and a gene-amplification test (FISH or CISH) are performed, record the result of the gene-amplification test in this field. However, if the gene-amplification test is given first and the result is borderline or equivocal and an IHC test is done to clarify these equivocal results, code the result of the IHC test.
Note 3: If the results of one test are available, and it is known that a second test is performed but the results are not available, use code 997.

Code	Description
010	Positive/elevated; amplified
020	Negative/normal; within normal limits; not amplified
030	Borderline; equivocal; indeterminate; undetermined whether positive or negative
988	Not applicable: Information not collected for this case (If this information is required by your standard setter, use of code 988 may result in an edit error.)
997	Test(s) ordered, results not in chart
998	Test(s) not done (test(s) not ordered and not performed)
999	Unknown or no information Not documented in patient record

CS Site-Specific Factor 15HER2: Summary Result of Testing