Breast

Note 1: Record the results of only the Chromogenic In Situ Hybridization (CISH) test for Human Epidermal Growth Factor Receptor 2 (HER2) in this field. The test determines whether there are additional copies of the HER2/neu gene in the tumor cells. The results are reported as the mean number of copies of the HER2/neu gene on either 30 or 60 tumor cells.
Note 2: Record the actual mean if given. Enter the stated mean 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 12 and 13.
Note 4: If the test is done but the actual mean 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	Mean of 1.00 - 9.79 (Enter exact mean to two decimal places) Examples: 100 1.0 120 1.2 564 5.64
980	Mean of 9.80 or greater
981-986	OBSOLETE DATA CONVERTED V0203 See code 980 Mean of 9.81 - 9.86
987	OBSOLETE DATA CONVERTED V0203 See code 980 Mean 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	Mean 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 12HER2: Chromogenic In Situ Hybridization (CISH) Lab Value