Breast

Note 1: Record the results of only the Fluorescence In Situ Hybridization (FISH) test for Human Epidermal Growth Factor Receptor 2 (HER2) in this field. The test determines if there are additional copies of the HER2/neu gene in the tumor cells compared to the normal number. The results are reported as a ratio between the number of copies of the HER2/neu gene and the number of copies of chromosome 17, on which the gene resides.
Note 2: Record the actual ratio if given. Enter the stated ratio to two decimal places. Use a trailing zero if needed.
Note 3: The same laboratory test should be used to record information in CS Site-Specific Factors 10 and 11.
Note 4: If the test is done but the actual ratio is not stated, use code 997.
Note 5: 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.

Code	Description
100-979	Ratio of 1.00 - 9.79 (Enter exact ratio to two decimal places) Examples: 100 1.0 120 1.2 564 5.64
980	Ratio of 9.80 or greater
981-986	OBSOLETE DATA CONVERTED V0203 See code 980 Ratio of 9.81 - 9.86
987	OBSOLETE DATA CONVERTED V0203 See code 980 Ratio of 9.87 or greater
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.)
991	Ratio of less than 1.00
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

CS Site-Specific Factor 10HER2: Fluorescence In Situ Hybridization (FISH) Lab Value