# Accuracy table

Information on the accuracy of a diagnostic test can be put into a table. Disease presence or absence must be determined by some means and this is usually called the 'gold' or 'reference' standard.

Disease present | Disease absent | |||||
---|---|---|---|---|---|---|

Test positive | True positive | False positive | ||||

Test negative | False negative | True negative | ||||

Total | TP + FN | FP + TN |

Sensitivity (the proportion of patients with disease who have a positive test) = true positive divided by true positive plus false negative.

Specificity (the proportion of patients without the disease who have a negative result) = true negative divided by true negative plus false positive.

Please drag and drop the correct definition into each box below.

**Sensitivity = TP/ (TP + FN) = **

- the proportion of patients with disease who have a positive test

** Specificity = TN/ (TN + FP) = **

- the proportion of patients without the disease who have a negative test

- the proportion of patients with disease who have a positive test
- the proportion of patients without the disease who have a negative test