New crossmatch assay "X" was evaluated in your laboratory. 100 cell-sera combinations were chosen and then tested using AHG-CDC and assay "X". AHG-CDC identified 50 positive crossmatches. Assay "X" reported 3 positive crossmatches that were negative by AHG-CDC. Assay "X" reported 17 negative crossmatches that were positive by CDC. All other results were the same. Assuming that AHG-CDC is the gold standard, what is the specificity of assay "X"?
A. 17%
B. 47%
C. 33%
D. 94%
Answer:D
New crossmatch assay "X" was evaluated in your laboratory. 100 cell-sera combinations were chosen and then tested using AHG-CDC and assay "X". AHG-CDC identified 50 positive crossmatches. Assay "X" reported 3 positive crossmatches that were negative by AHG-CDC. Assay "X" reported 17 negative crossmatches that were positive by CDC. All other results were the same. Assuming that AHG-CDC is the gold standard, what is the specificity of assay "X"?
A. 17% B. 47% C. 33% D. 94%