TABLE 1.

NordiQC Scoring Criteria

Score	Scoring Criteria	Scoring Status
Optimal	The staining is considered perfect or close to perfect in all of the included tissues.	Sufficient: passed
Good	The staining is considered fully acceptable in all of the included tissues. However, the protocol may be optimized to improve the proportion and/or staining intensity of cells demonstrated and/or optimize the technical quality as signal-to-noise ratio, morphology, etc.	Sufficient: passed
Borderline	The staining is considered insufficient, because of a generally too weak staining reaction, a false-negative/false-positive result in one of the included tissues and/or inferior technical quality. The protocol should be optimized.	Insufficient: failed
Poor	The staining is considered insufficient, because of a false-negative/false-positive result in 2* or more of the included tissues and/or inferior technical quality. The protocol should be optimized.	Insufficient: failed

^*For type 2 IHC assays, 1 false-negative/false-positive result can be scored as poor.