We evaluated three LFAs (Alltest, One Step and SeroFlash), one ELISA (Dia.Pro) and two CLIAs (Elecsys and COV2T).  Overall sensitivity was 61.3 %, 73.8 %, 67.5 %, 85.9 %, 88.0 % and 92.0 % for Alltest, One Step, SeroFlash, Dia.Pro, Elecsys and COV2T, respectively.  Sensitivity increased throughout the first two weeks from the onset of symptoms, reaching sensitivities over 85 % from 14 days for all LFAs, being One Step the most sensitive (97.6 %), followed by SeroFlash (95.1 %).  One Step showed the best agreement results among LFAs, showing excellent agreement with Dia.Pro (agreement = 94.2 %, k = 0.884), COV2T (99.1 %, k = 0.981) and Elecsys (97.3 %, k = 0.943).  One Step, Dia.Pro, Elecsys and COV2T obtained the best diagnostic performance results. 
One Step
We evaluated three LFAs (Alltest, One Step and SeroFlash), one ELISA (Dia.Pro) and two CLIAs (Elecsys and COV2T).  Overall sensitivity was 61.3 %, 73.8 %, 67.5 %, 85.9 %, 88.0 % and 92.0 % for Alltest, One Step, SeroFlash, Dia.Pro, Elecsys and COV2T, respectively.  Dia.Pro, Elecsys and COV2T showed sensitivities over 97 % from 14 days, being 100 % for COV2T.  One Step showed the best agreement results among LFAs, showing excellent agreement with Dia.Pro (agreement = 94.2 %, k = 0.884), COV2T (99.1 %, k = 0.981) and Elecsys (97.3 %, k = 0.943).  Dia.Pro, COV2T and Elecsys also showed excellent agreement between them.


 One Step, Dia.Pro, Elecsys and COV2T obtained the best diagnostic performance results. 
Dia.Pro
We evaluated three LFAs (Alltest, One Step and SeroFlash), one ELISA (Dia.Pro) and two CLIAs (Elecsys and COV2T).  Overall sensitivity was 61.3 %, 73.8 %, 67.5 %, 85.9 %, 88.0 % and 92.0 % for Alltest, One Step, SeroFlash, Dia.Pro, Elecsys and COV2T, respectively.  Dia.Pro, Elecsys and COV2T showed sensitivities over 97 % from 14 days, being 100 % for COV2T.  One Step showed the best agreement results among LFAs, showing excellent agreement with Dia.Pro (agreement = 94.2 %, k = 0.884), COV2T (99.1 %, k = 0.981) and Elecsys (97.3 %, k = 0.943).  Dia.Pro, COV2T and Elecsys also showed excellent agreement between them.


 One Step, Dia.Pro, Elecsys and COV2T obtained the best diagnostic performance results. 
Elecsys
We evaluated three LFAs (Alltest, One Step and SeroFlash), one ELISA (Dia.Pro) and two CLIAs (Elecsys and COV2T).  Overall sensitivity was 61.3 %, 73.8 %, 67.5 %, 85.9 %, 88.0 % and 92.0 % for Alltest, One Step, SeroFlash, Dia.Pro, Elecsys and COV2T, respectively.  Dia.Pro, Elecsys and COV2T showed sensitivities over 97 % from 14 days, being 100 % for COV2T.  One Step showed the best agreement results among LFAs, showing excellent agreement with Dia.Pro (agreement = 94.2 %, k = 0.884), COV2T (99.1 %, k = 0.981) and Elecsys (97.3 %, k = 0.943).  Dia.Pro, COV2T and Elecsys also showed excellent agreement between them.


 One Step, Dia.Pro, Elecsys and COV2T obtained the best diagnostic performance results. 
COV2T