Porte 2020b [B].

Study characteristics
Patient Sampling	Comparative study of two Ag tests; Porte 2020b [A] reports full study characteristics and QUADAS
Patient characteristics and setting
Index tests	Comparative study of two Ag tests (no product codes reported); Porte 2020b [B] data relate to test [B], see Porte 2020b [A] for data relate to test [A] and QUADAS entries [A] SOFIA SARS Antigen FIA [B] STANDARD® F COVID‐19 Ag FIA Manufacturer: [A] Quidel Corporation, San Diego, CA, USA [B] SD Biosensor Inc, Gyeonggi‐do, Republic of Korea Antibody: NP (both) Antigen target: Not stated Test method: Both FIA Samples used: naso‐oropharyngeal flocked swabs; obtained by trained personnel Transport media: UTM‐RT® System, Copan Diagnostics Sample storage: stored at ‐80 degrees C following RT‐PCR Test operator: Laboratory staff Definition of test positivity: As per manufacturer; both using analyzer device Blinding reported: Yes; blinded to RT‐PCR result Timing of samples: All <5 days p.s.o; median PCR+: 2 days (IQR 1‐3); PCR‐: 1 day (IQR 0.75‐4)
Target condition and reference standard(s)	Comparative study of two Ag tests; Porte 2020b [A] reports full study characteristics and QUADAS
Flow and timing	Comparative study of two Ag tests; Porte 2020b [A] reports full study characteristics and QUADAS
Comparative
Notes