Our iCare HIV tests have greater than 99% sensitivity and 99% specificity (both blood and oral versions). Apart from HIV, all other iCare STD tests usually have sensitivities and specificities above or close to 99%. These percentages are derived from lab trials. “Sensitivity” refers to the probability that, if an infected person takes the test, he will get a positive result; while “specificity” refers to the probability that, if a non-infected person takes the test, he will get a negative result. The higher the sensitivity/specificity, the better. A high sensitivity means the likelihood of missing an infection is low. A high specificity means the likelihood of a “false alarm” is low.