Percentage of surgical pathology reports for breast carcinoma with appropriate human epidermal growth factor receptor 2 (HER2) breast tumor evaluation Three rates are submitted. 1. Percentage of surgical pathology reports for breast carcinoma with a quantitative breast tumor evaluation using HER2 IHC or ISH, that had an HER2 result derived using the ASCO/CAP guideline optimal scoring algorithm 2. Percentage of surgical pathology reports for breast carcinoma with an equivocal HER2 result obtained using the ASCO/CAP guideline optimal scoring algorithm that had a subsequent repeat HER2 test completed 3. Percentage of surgical pathology reports for breast carcinoma with a quantitative breast tumor evaluation using HER2 IHC or ISH, that had an HER2 result derived using the ASCO/CAP guideline optimal scoring algorithm AND when an equivocal HER2 result was obtained, had a subsequent repeat HER2 test completed Performance rate 3 is the reported rate INSTRUCTIONS: This measure is to be reported each time a breast carcinoma report is finalized during the performance period. This measure may be submitted by eligible clinicians who perform the quality actions described in the measure based on the services provided and the measure-specific denominator coding.