Table 1.
Comparison of results (raw data, quantitative and qualitative) of the two IGRAs.
| Sample ID | Patient Initials |
Test | BLANK | S Tube | Stim Tube | S Variant Tube | NC Tube | QuantitativeResult (mIU/mL) | QualitativeResult |
|---|---|---|---|---|---|---|---|---|---|
| 1 | SO | EUROIMMUN | 19.67 | 82.76 | >max | - | - | 63 | Negative |
| SD BIOSENSOR | 0.111 | 0.126 | >10 | 0.071 | 0.008 | - | Non-reactive | ||
| 2 | LL | EUROIMMUN | 25 | 23.74 | >max | - | - | 0 | Negative |
| SD BIOSENSOR | 0.099 | 0.088 | >10 | 0.033 | −0.011 | - | Non-reactive | ||
| 3 | BLT | EUROIMMUN | 14.27 | 72.04 | 689.32 | - | - | 57.8 | Negative |
| SD BIOSENSOR | 0.069 | 0.418 | >10 | 0.371 | 0.021 | - | Reactive | ||
| 4 | SM | EUROIMMUN | 26.49 | 61.23 | >max | - | - | 35 | Negative |
| SD BIOSENSOR | 0.058 | −0.005 | >10 | 0.018 | X | - | Non-reactive | ||
| 5 | LT | EUROIMMUN | 44.04 | 43.19 | 94.8 | - | - | Invalid | Invalid |
| SD BIOSENSOR | 0.232 | −0.139 | 1.267 | −0.111 | −0.146 | - | Non-reactive | ||
| 6 | VD | EUROIMMUN | 22.47 | 102.76 | 1662.49 | - | - | 80 | Negative |
| SD BIOSENSOR | 0.109 | 0.091 | >10 | −0.025 | −0.04 | - | Non-reactive | ||
| 7 | IC | EUROIMMUN | 34.13 | 42.72 | 145.67 | - | - | Invalid | Invalid |
| SD BIOSENSOR | 0.298 | −0.166 | 1.039 | −0.16 | −0.222 | - | Non-reactive | ||
| 8 | CF | EUROIMMUN | 73.42 | 99.27 | >max | - | - | 26 | Negative |
| SD BIOSENSOR | 0.173 | −0.033 | >10 | −0.026 | −0.048 | - | Non-reactive | ||
| 9 | SG | EUROIMMUN | 51.2 | 142.15 | >max | - | - | 91 | Negative |
| SD BIOSENSOR | 0.115 | 0.142 | >10 | 0.065 | 0.023 | - | Non-reactive | ||
| 10 | MG | EUROIMMUN | 22.34 | 26.72 | >max | - | - | 4 | Negative |
| SD BIOSENSOR | 0.055 | −0.003 | >10 | 0.011 | 0.132 | - | Non-reactive | ||
| 11 | TM | EUROIMMUN | 3.99 | 26.93 | >max | - | - | 22.9 | Negative |
| SD BIOSENSOR | 0.107 | 0.465 | >10 | 0.029 | −0.035 | - | Reactive | ||
| 12 | PO | EUROIMMUN | 13.07 | 56.52 | >max | - | - | 43 | Negative |
| SD BIOSENSOR | 0.105 | −0.029 | >10 | −0.036 | −0.053 | - | Non-reactive | ||
| 13 | PM | EUROIMMUN | <min | 3.99 | 104.82 | - | - | Invalid | Invalid |
| SD BIOSENSOR | 0.077 | −0.022 | >10 | −0.022 | −0.024 | - | Non-reactive | ||
| 14 | MB | EUROIMMUN | 36.53 | 351.76 | >max | - | - | 315 | Positive |
| SD BIOSENSOR | 0.138 | 0.302 | >10 | 0.125 | 0.263 | - | Reactive |
Euroimmun data are expressed in mIU/mL adjusted to international reference material (NIBSC, 82/587). S, S VARIANT and NC tubes values are blank subtracted. S: S1 domain of the spike protein for Euroimmun and spike derived from SARS-CoV-2 and 20I/501Y.V1 variant (originator) for SD Biosensor; STIM: stimulation (mytogen); S VARIANT: spike protein antigen derived from 20H/501.V2 and 20J/501Y.V3 variants; NC: Nucleocapsid.