Blood Group: 


Causes HDN: Yes
Critical Titer:
Very little is known about anti-good. The good antigen is so scarce that it has been tested against over 1400 samples and was not found. It is known that the direct coombs test may be negative with anti-Good and still cause severe HDN. The original Mrs. Good (who the antigen was named after) lost 4 children to HDN with titers of 1:8 that ended at 1:16 (in saline) 3 months after the last birth. [2] 


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