Table 2

UK-RTC AbC-19 LFIA performance metrics against known antibody positive and known antibody negative cohorts

Total negativeTrue negativeFalse positiveTotal positiveTrue positiveFalse negativeSensitivity
% (95 CI)
Specificity
% (95 CI)
Pre-pandemic (n=223)
2232221n/an/an/an/a99.55 (97.53 to 99.99)
Initially reported cohorts (n=654)
3503500304297797.70
(95.31 to 99.07)
100.00
(98.95 to 100.00)
Extended cohorts (n=818)
4884862330322897.58
(95.28 to 98.95)
99.59
(98.53 to 99.95)
  • LFIA, lateral flow immunoassay; n/a, not available.