|  | Reality |  |
---|
 |  | + | - |  |
---|
Liquid culture | + | TP | FP | p |
 | - | FN | TN | q |
- A standard diagnostic 2 × 2 table visualizes the results of performing a diagnostic liquid culture test on a batch of samples from MTB suspects. Since liquid culture is the gold standard, the results are hypothetically compared to reality. The letters indicate different sample categories; TP true positive, FP false positive, FN false negative, TN true negative. p is number of samples tested positive by liquid culture, q is number of samples tested negative by liquid culture.